Give two examples of perpendicular lines

In math, if you see perpendicular lines, they will have a little square in the corner to show that this is a perpendicular line with a right angle. They use this square because squares must have.. Give your children opportunities to observe perpendicular lines in objects or places around them, such as a tall tree on the ground, an electric pole on the pavement, railway intersection, corner of two adjacent walls and high buildings Example 1: The given picture shows the perpendicular lines in the floor tiles. Example 2: In the given picture, the vertical and the horizontal lines (black and pink) in the English alphabet 'H' are perpendicular lines. Through the given diagram, we can visualize the difference between perpendicular and non-perpendicular lines A perpendicular line is a straight line through a point. It makes an angle of 90 degrees with a particular point through which the line passes. Coordinates and line equation is the prerequisite to finding out the perpendicular line. Consider the equation of the line is ax + by + c = 0 and coordinates are (x 1, y 1), the slope should be − a/b.

One common example of perpendicular lines in real life is the point where two city roads intersect. When one road crosses another, the two streets join at right angles to each other and form a cross-type pattern. Perpendicular lines form 90-degree angles, or right angles, to each other on a two-dimensional plane If two lines are perpendicular to the same line, they are parallel to each other and will never intersect. Adjacent sides of a square and a rectangle are always perpendicular to each other. Sides of the right-angled triangle enclosing the right angle are perpendicular to each other Like parallel lines, examples of perpendicular lines surround us, in walls meeting floors and ceilings, in floor tiles, in bricks in walls, in window grilles. The margin line on a sheet of notebook paper is perpendicular to the parallel writing lines. Parallel and Perpendicular Line Equation To be perpendicular, they only need to have opposite reciprocal slope. For example, the lines, y=3x+8 and y= - (1/3)x-3 would be perpendicular because -1/3 is the opposite reciprocal of 3. (4 votes We can determine from their equations whether two lines are parallel by comparing their slopes. If the slopes are the same and the y-intercepts are different, the lines are parallel. If the slopes are different, the lines are not parallel. Unlike parallel lines, perpendicular lines do intersect. Their intersection forms a right or 90-degree angle

Topics Parallel & Perpendicular 3. Parallel Lines : In geometry, parallel lines are lines in a plane which do not meet; that is, two lines in a plane that do not intersect or touch each other at any point are said to be parallel. Example : Parallel lines in real life 4. Perpendicular Lines : Perpendicular means at right angles Example of a perpendicular line: Here, the blue line and the green line are perpendicular to each other. Examples of lines that are not perpendicular: Here, in each example, the angle between the two lines is NOT \(90^{\circ}\) Hence, they are NOT perpendicular

Perpendicular Lines Lesson for Kids: Definition & Examples

What are Perpendicular Lines? [Definition, Facts & Example

  1. What is difference between parallel l8ne and perpendicular line?Please give me the answer with examples. What is a transversal? Illustrate with an example. Name the angles formed by a transversal when it cuts 2 lines m and p. When a transversal cuts a pair of parallel lines, illustrate and show the corresponding angles
  2. Hello, welcome to lead a learning today. We are going to see a question that is give you two examples from your surroundings for each of the following intersecting lines parallel lines and perpendicular lines. So in our surroundings, there are so many things you can see not every life
  3. To be perpendicular, they only need to have opposite reciprocal slope. For example, the lines, y=3x+8 and y= - (1/3)x-3 would be perpendicular because -1/3 is the opposite reciprocal of 3. Comment on MichaelCat87's post No, they can have different y-intercepts
  4. Examples of parallel lines are all around us, such as the opposite sides of a rectangular picture frame and the shelves of a bookcase. Perpendicular lines are two or more lines that intersect at a 90-degree angle, like the two lines drawn on this graph. These 90-degree angles are also known as right angles
  5. For example: The line is parallel to the line. Their slopes are both the same. In the Coordinate Plane, two lines are perpendicular if the product of their slopes (m) is -1. The slopes are negative reciprocals of each other. For example: The line is perpendicular to the line y = -2x - 1. The product of the two slopes i
  6. Perpendicular Lines and Slopes. The slopes of two perpendicular lines are negative reciprocals of each other. This means that if a line is perpendicular to a line that has slope m, then the slope.

Perpendicular Lines and Slopes Perpendicular lines are lines that intersect at right angles. If you multiply the slopes of two perpendicular lines in the plane, you get − 1 .That is, the slopes of perpendicular lines are opposite reciprocals . (Exception: Horizontal and vertical lines are perpendicular, though you can't multiply their slopes, since the slope of a vertical line is undefined. Algebra Examples. Step-by-Step Examples. Algebra. Systems of Equations. Compare the slopes of the two equations. then the lines are perpendicular. If the they are not equal, then the lines are not perpendicular. The equations are perpendicular because the slopes of the two lines are negative reciprocals All of the lines shown in the graph are parallel because they have the same slope and different y-intercepts.. Lines that are perpendicular intersect to form a [latex]{90}^{\circ }[/latex] angle. The slope of one line is the negative reciprocal of the other. We can show that two lines are perpendicular if the product of the two slopes is [latex]-1:{m}_{1}\cdot {m}_{2}=-1[/latex]

Parallel And Perpendicular Lines - Definition with Example

Parallel lines have the same slope and will never intersect. Parallel lines continue, literally, forever without touching (assuming that these lines are on the same plane). Parallel Lines in greater depth. On the other hand, the slope of perpendicular lines are the negative reciprocals of each other, and a pair of these lines intersects at 90. The best way to get practice proving that a pair of lines are perpendicular is by going through an example problem. Example: Write a proof for the following scenario: Given that line m is perpendicular to line n, prove: that angle 1 and angle 2 are complementary to each other Example 1. Are two lines perpendicular? Fig 1. Are these lines perpendicular? In Fig 1, the line AB and a line segment CD appear to be at right angles to each other. Determine if this is true. To do this, we find the slope of each line and then check to see if one slope is the negative reciprocal of the other Perpendicular Lines. Two line are perpendicular when they are at right angles to each other. The red line is perpendicular to the blue line in each of these examples: (Read more about perpendicular lines.) Perpendicular to a Plane. A line is perpendicular to a plane when it extends directly away from it, like a pencil standing up on a table Theorem 10.1: Given a point A on a line l, there exists a unique line m perpendicular to l which passes through A.; The drawing is shown in Figure 10.2. Given a line l and a point A on l, suppose there are two lines, m and n, which both pass through A and are perpendicular to l

Perpendicular Line Formula with Solved Example

  1. Perpendicular lines have opposite-reciprocal slopes, so the slope of the line we want to find is 1/2. Plugging in the point given into the equation y = 1/2 x + b and solving for b , we get b = 6. Thus, the equation of the line is y = ½ x + 6
  2. Perpendicular Lines. Two lines are Perpendicular when they meet at a right angle (90°). Example: Find the equation of the line that is. perpendicular to y = −4x + 10 ; and passes though the point (7,2) The slope of y=−4x+10 is: −4. The negative reciprocal of that slope is: m = −1−4 = 14. So the perpendicular line will have a.
  3. Then the two lines are parallel if m 1 = m 2 m_1 = m_2 m 1 = m 2 and b 1 ≠ b 2 b_1 \ne b_2 b 1 = b 2 . Intuitively, if two distinct lines have the same rate of change, then the lines always point in the same direction and thus will never meet. In the above image, the slope-intercept form for the two lines ar
  4. Hint: first draw a line, longer than 5 cm. Mark two points on it, 5 cm apart. Now draw two lines perpendicular to your starting line that go through those points. 10. Find rays, lines, and line segments that are either parallel or perpendicular to each other. You can use these shorthand notations: ∥ for parallel and ⊥ for perpendicular
  5. Example Problem. If two planes When two planes are perpendicular, the dot product of their normal vectors is 0. Hence, What is the equation of the plane which passes through point A = (2, 1, 3) A=(2,1,3) A = (2, 1, 3) and is perpendicular to line segment B C.
  6. Put this together with the sign change, and you get that the slope of a perpendicular line is the negative reciprocal of the slope of the original line — and two lines with slopes that are negative reciprocals of each other are perpendicular to each other. To give a numerical example of negative reciprocals, if the one line's slope is.
  7. There are various examples of both parallel lines and perpendicular lines all around us that we see every day. Two side of a page, rails of railways tracks, staircase railings, steps of a ladder, legs of a chair, edges of walls and ceilings, adjacent telephone poles, frames of buildings, are all examples of parallel lines in real life

What Is an Example of Perpendicular Lines in Real Life

NCERT Class VI Mathematics Chapter 5 Understanding

Generic intersecting lines: Perpendicular (orthogonal) lines: Collinear lines (two of the same line definitely intersect!) And, just for kicks.. What is a line anyway? Straight, you say? Shortest distance between two points, you say? Well ther.. Ever seen a football game? Observed the white-lined sidelines? Each sideline is parallel to each other. Each goal line is parallel to the other one. Rectangles have opposite sides that are parallel to each other. With a trapezoid, no it is not a d.. Finding the Slopes of Parallel and Perpendicular Lines How do we know if two distinct lines are parallel, perpendicular or neither? To make that determination, we need to review some background knowledge about slope. Concept 1: When two points are given, the slope of a line can be algebraically solved using the following formula: Slope Slopes of Parallel and Perpendicular Lines Read More

What is Perpendicular? - Definition, Facts & Exampl

Perpendicular Lines Two lines are perpendicular if . Another way of saying this is the slopes of the two lines must be negative reciprocals of each other. Example 2: Find the slope of the line perpendicular to the line -6x - 9y = 4. To find the slope of this line we need to get the line into slope-intercept form (y = mx + b) Perpendicular definition is - standing at right angles to the plane of the horizon : exactly upright. How to use perpendicular in a sentence. Synonym Discussion of perpendicular Free perpendicular line calculator - find the equation of a perpendicular line step-by-step. This website uses cookies to ensure you get the best experience. By using this website, you agree to our Cookie Policy. Learn more Accept. Related » Graph » Number Line » Examples. Now, as long as you have a slope and point you can find the equation of the line. And you do, you want a slope of 3 and a point (-2,3). To use this you use point slope form. y - y1 = m (x - x1) where (x1, y1) is the point you want. and m is slope. So just fill in and solve

Parallel and Perpendicular Lines - Equations, Examples

Perpendicular lines from equation Analytic geometry

Find the equation of a line in standard form that passes through the point (-5,2) and is perpendicular to the line 2x + 5y = 7. Here is how with GeoGebra an.. The perpendicular part must be at a right angle to this tangent, which means it must be toward or away from the center of the circle. Unlike the tangent case, however, both directions are not possible. We can see this by considering the average perpendicular acceleration vector over two nearby moments in time Example: Here l,m,n & o lines are passing through the same point of P . So these lines are called Concurrent lines. The point P is called the point of concurrency or concurrent point. Perpendicular Lines. If the measuring of the angle between two lines is 90 o then the two lines are perpendicular lines Perpendicular recording enables the bits to be magnetized on end, perpendicular to the disk surface. Finally, it allows spatial resolution in the plane perpendicular to the optical axis.: In each plot, we established two 50-m-long transects perpendicular to each other, centered in the plot and oriented along cardinal points.: In the hypothesis of acute angle, we can, find a perpendicular and. Perpendicular style, Phase of late Gothic architecture in England roughly parallel in time to the French Flamboyant style.The style, concerned with creating rich visual effects through decoration, was characterized by a predominance of vertical lines in stone window tracery, enlargement of windows to great proportions, and conversion of the interior stories into a single unified vertical expanse

Cluster: Draw and identify lines and angles, and classify shapes by properties of their lines and angles. KY.4.G.2 Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence of absence of angles of a specified size. Recognize right triangles as a category and identify right triangles. MP. 15.2 15.1.2 15.1.1 Give a reason why PM 15.1 QUESTION 15 PR P is the centre of the circle with radius 73 units. Non-Euclidean geometry involves spherical geometry and hyperbolic geometry, which is used to convert the spherical geometrical calculations to Circle Worksheets Circumference, Area, Radius, and Diameter Worksheets. Give examples of the kinds of work that is necessary. Go to your. Example 3: is perpendicular to. Example 4: Given the line and the point , find lines through the point that are. 1: parallel to the given line and. 2: perpendicular to it. Solution for parallel line: Clearly, the first thing needed is to solve for , so that the reference slope can be found: So the reference slope from the reference line is several examples of parallel lines, parallel planes, and skew lines. Reading Math The term parallel and the notation are used for lines, segments, rays, and planes. The symbol means is not parallel to. Study Tip • Identify the relationships between two lines or two planes. • Name angles formed by a pair of lines and a transversal. m Robert. An example of two lines that are perpendicular is given by the following, These two lines intersect one another and form ninety degree (90°) angles at the point of intersection. The graphs of y 3 and y 4 are provided below, ***** In the next section we will describe how to solve linear equations. Linear equations.

Intersecting lines. Two or more lines that meet at a point are called intersecting lines. That point would be on each of these lines. In Figure 1, lines l and m intersect at Q. Figure 1 Intersecting lines. Perpendicular lines. Two lines that intersect and form right angles are called perpendicular lines. The symbol ⊥ is used to denote. Pre-Algebra Examples. Step-by-Step Examples. Pre-Algebra. Linear Equations and Inequalities. Find Any Equation Perpendicular to the Line. Choose a point that the perpendicular line will pass through. Use the slope-intercept form to find the slope Example: Find the equation of the line that is perpendicular to 2x = y - 5 and that passes through the point (4, -3). Write the equation in standard form. Solution: Step 1: Find the slope of the equation given. I want a line that is perpendicular to it, so I need to find the negative reciprocal of the other line's slope This module deals with parallel, perpendicular and intersecting lines. A variety of pdf exercises and word problems will help improve the skills of students in grade 3 through grade 8 to identify and differentiate between parallel, perpendicular and intersecting lines Question 3 Find the real number k so that the points A(-2 , k), B(2 , 3) and C(2k , -4) are the vertices of a right triangle with right angle at B. Solution to Question 3 ABC is a right triangle at B if and only if vectors BA and BC are perpendicular. And two vectors are perpendicular if and only if their scalar product is equal to zero. Let us first find the components of vectors BA and BC.

The following diagram shows an example of four force vectors, two vectors that are parallel to each other and the \(y\)-axis as well as two that are parallel to each other and the \(x\)-axis. To emphasise that the vectors are perpendicular you can see in the figure below that when originating from the same point the vector are at right angles The dot product gives us a very nice method for determining if two vectors are perpendicular and it will give another method for determining when two vectors are parallel. Note as well that often we will use the term orthogonal in place of perpendicular. Now, if two vectors are orthogonal then we know that the angle between them is 90 degrees Perpendicular lines intersect at right angles to one another. To figure out if two equations are perpendicular, take a look at their slopes. The slopes of perpendicular lines are opposite reciprocals of each other. Their product is -1! Watch this tutorial and see how to determine if two equations are perpendicular The gradient of the given line is -3, so the gradient of the perpendicular line must be-\left(\dfrac{1}{-3}\right) = \dfrac{1}{3} The two minus signs cancel, so the result is a positive number. The gradient of one line and another line perpendicular to it will always have opposite signs - if one is negative the other will always be positive and vice versa

What is the relationship between perpendicular lines

③ EXAMPLE Given the line 2x - 3y = 6 a) Write an equation of a line parallel to that line through the origin, (0,0). (The form will be y = mx + 0) b) Write an equation of a line perpendicular to that line through the origin,(0,0). (The form will be y = mx + 0) c) Graph the three lines Example using perpendicular distance formula (BTW - we don't really need to say 'perpendicular' because the distance from a point to a line always means the shortest distance.) This is a great problem because it uses all these things that we have learned so far What does line mean? A geometric figure formed by a point moving along a fixed direction and the reverse direction. (noun

Two lines are perpendicular if they intersect in a right angle. The axes of a coordinate plane is an example of two perpendicular lines. In algebra 2 we have learnt how to find the slope of a line. Two parallel lines have always the same slope and two lines are perpendicular if the product of their slope is -1 Line L passes through the points (4 , -5) and (3 , 7). Find the slope of any line perpendicular to line L. Question 5 Find the slope of the line given by it equation: 2 x + 4 y = 10. Question 6 Write an equation, of the slope intercept form, of the line passing through the points (2 , 3) and (4 , 6). Question Lines, Rays, and Angles. This fourth grade geometry lesson teaches the definitions for a line, ray, angle, acute angle, right angle, and obtuse angle. We also study how the size of the angle is ONLY determined by how much it has opened as compared to the whole circle. The lesson contains many varied exercises for students Equation of a Line Segment As the last two examples illustrate, we can also -nd the equation of a line if we are given two points instead of a point and a direction vector. Let™s derive a formula in the general case. Suppose that we are given two points on the line P 0 = (x 0;y o;z 0) and P 1 = (x 1;y 1;z 1). Then! P 0P 1 = hx 1 x 0;y 1 y 0. Parallel and Perpendicular Line Calculator. The calculator will find the equation of the parallel/perpendicular line to the given line passing through the given point, with steps shown. For drawing lines, use the graphing calculator. If you need to find a line given two points or a slope and one point, use line calculator

Parallel and Perpendicular Lines College Algebr

Perpendicular Transversal Theorem - In a plane, if a line is perpendicular to one of two parallel lines, then it is perpendicular to the other. b||c and a ⊥b Given ∠1 is a 90o angle Definition of Perpendicular Lines ∠1≅∠2 Parallel Lines Postulate m∠2 is 90o Transitive Property a ⊥c Definition of Perpendicular Lines Constructing a perpendicular at the endpoint of a ray; Perpendicular lines in Coordinate Geometry In Coordinate Geometry (where all points are described by two numbers which specify the x and y location of the point), a line is perpendicular to another if the slopes of the lines have a certain relationship. For more on this, see Perpendicular.

Since our line is perpendicular to a line that has a slope of 2/5, our line has a slope of -5/2 (the negative reciprocal of 2/5). OK, now we have our slope, which is -5/2. Now it is just like problems in Tutorial 26: Equations of Lines , we put the slope and one point into the point/slope equation Lines and planes in space (Sect. 12.5) Lines in space (Today). I Review: Lines on a plane. I The equations of lines in space: I Vector equation. I Parametric equation. I Distance from a point to a line. Planes in space (Next class). I Equations of planes in space. I Vector equation. I Components equation. I The line of intersection of two planes. I Parallel planes and angle between planes Action 1 - launch the geo tool Points along geometry with a point offset of 50 m as shown in the figure below. Figure 2. The result is shown in the figure below. Figure 3. Action 2, 3 - launch the PointToPath geo tool see the figure below. Figure 4. then run the geo tool ExplodeLines see the figure below

Two lines that are perpendicular in the same plane have reciprocal slopes of opposite sign. If the slope of a line is m , then the slope of any line perpendicular to it is -1 / m Problem: Find the equation of a line that passes through the point (-1, 4) and is perpendicular to the line passing through points (2, 7) and (-1, -3) Graph the two equations and measure one of the angles that forms; according to the definition of a perpendicular line, all four angles have to measure 90 degrees. If the lines are horizontal and vertical, then they are perpendicular due to the squares of the coordinate grid Theorem: Euclid's Postulate V is equivalent to the Euclidean Parallel Postulate. ~ First we assume EPP and prove from it Postulate V. Suppose l and m are two lines cut by a transversal t at points P and Q respectively in such a way that the interior angles on one side of t have measures adding to less than 180 Example: Intersecting lines. An example of using the intersection coordinate systems. Both the intersection and perpendicular coordinate system are used. The latter is a special case of the former, but has the shorter and more convenient -| and |- syntax Lines Consider a line, a vector x 0 going from the origin to a point on the line and a vector v parallel to the line. Clearly, if one places a multiple tv of v at the tip of x 0, its tip will be on the line. This leads to the following vector equation for the line: x = x 0 +vt. Example Consider the line through (2,8,3) and (5,3,9). We may take

Say whether the planes are parallel, perpendicular, or neither. If the planes are neither parallel nor perpendicular, find the angle between the planes. 3 x − y + 2 z = 5 3x-y+2z=5 3 x − y + 2 z = 5. x + 4 y + 3 z = 1 x+4y+3z=1 x + 4 y + 3 z = 1. First we'll find the normal vectors of the given planes. For the plane 3 x − y + 2 z = 5 3x. Algebra > Lines > Finding the Slope of a Line from Two Points Page 1 of 2. Finding the Slope of a Line from Two Points. Let's use the examples in the last lesson... We'll use the first one to find a formula. Perpendicular Lines. Graphing Linear Inequalities. Horizontal and Vertical Lines. Exercises. Interval Notation 2 A right angle is an angle measuring 90 degrees. Two lines or line segments that meet at a right angle are said to be perpendicular. Note that any two right angles are supplementary angles (a right angle is its own angle supplement). Example: The following angles are both right angles

Parallel And Perpendicular With Real Life Example

When the shape of the land is polygonal*, you should usually subdivide the total area you need to measure into a series of regular geometrical figures (1-7 in the example) from a common base line AD. You will lay out offsets from the other summits of the polygon* which are perpendicular to this base line to form right triangles 1,3,4 and 7, and. Perpendicular lines: When there is a right angle between two lines, the lines are said to be perpendicular to each other. Here, the lines OA and OB are said to be perpendicular to each other. Parallel lines: Here, A and B are two parallel lines, intersected by a line p. The line p is called a transversal, that which intersects two or more lines. 1) find the end point of line A and line B that is closer to the intersecting point. In your example, it will be point (x2,y2) and point (x4,y4) 2) project these two points along the direction perpendicular to the line itself and onto the bisecting line. In your example, project (x2, y2) along the yellow line direction onto the bisecting line

Perpendicular Lines Definition, Construction, and

  1. ] It implies that these are corresponding angles
  2. Example: Children sitting on a see-saw. Their weights are the example of parallel forces. If there are two forces which are equal and opposite they form a couple. Couple: When two forces of equal magnitude opposite in direction and acting along parallel straight lines, then they are said to form a couple
  3. A horizontal line has a slope of zero and a vertical line has an undefined slope. These two lines are perpendicular, but the product of their slopes is not -1. Doesn't this fact contradict the definition of perpendicular lines? No. For two perpendicular linear functions, the product of their slopes is -1
  4. For example, two points uniquely define a line, and line segments can be infinitely extended. Two intersecting lines have the same properties as two intersecting lines in Euclidean geometry. For example, two distinct lines can intersect in no more than one point, intersecting lines form equal opposite angles, and adjacent angles of intersecting.
  5. Theorem 11: If each of two planes is parallel to a third plane, then the two planes are parallel to each other (Figure 2). Figure 2 Two planes parallel to a third plane. Perpendicular planes. A line l is perpendicular to plane A if l is perpendicular to all of the lines in plane A that intersect l. (Think of a stick standing straight up on a.
  6. Perpendicular definition, vertical; straight up and down; upright. See more
  7. Given two lines in the two-dimensional plane, the lines are equal, they are parallel but not equal, or they intersect in a single point. In three dimensions, a fourth case is possible. If two lines in space are not parallel, but do not intersect, then the lines are said to be skew lines (Figure \(\PageIndex{5}\))
Point Slope Form (Simply Explained w/ 17 Examples!)

This says that the gradient vector is always orthogonal, or normal, to the surface at a point. So, the tangent plane to the surface given by f (x,y,z) = k f ( x, y, z) = k at (x0,y0,z0) ( x 0, y 0, z 0) has the equation, This is a much more general form of the equation of a tangent plane than the one that we derived in the previous section Note: at points where the traverse changes direction (for example, at point 175 in the drawing), you should set out two perpendicular lines E and F; each line will be perpendicular to one of the traverse sections

Locus of a Point (solutions, examples, videos)

Perpendicular lines have a bit of a twist to them. Two lines are perpendicular if they cross (remember, any two straight lines that are NOT parallel will cross at only a single point. They cannot ever intersect again unless they curve back on themselves, in which case they are not straight!) and they form a 90 degree angle, or rather, a T-shape. A line which divides a line segment into two equal parts at 90° making a right angle. Perpendicular bisector equation. Equation of a perpendicular line bisector is given below. y - y 1 = m ( x - x 1) Where, m is slope of the line, and. x 1, y 1 are midpoint of the co-ordinates. How to find equation of perpendicular bisector? Example Definition of boundary: For lines, the boundary is the two endpoints; for polygons, the boundary is the edge. Contains —Selects features in the input feature layer that contain a feature in the selecting features layer. The selecting features can be inside as well as on the boundary of the input feature layer Use the point/slope equation to set up an equation given two points on the line. point/slope equation to set up an equation given a point on the line and a perpendicular line. Introduction. We are going to use it again to help us come up with equations of lines as well as give us another way to graph lines (a) Select two points A and B on the chain line on opposite banks of the river. [Fig. 3.22 (a)]. From A and C, erect perpendicular or parallel lines AD and CE, such that E, D and B are in line. Measure AC, AD and CE. If a line DF is drawn parallel to AC, meeting CE in F, the triangles ABD and FDE are similar

Real World Geometry!mrwadeturner / M4 Perpendicular Transversals and Transitivity