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www.khanacademy.org/.../parallel-perp/v/parallel-and-perpendicular-lines-intro

Parallel lines never intersect, and perpendicular lines intersect at a 90 degree angle. Learn how to identify parallel and perpendicular lines.

www.differencebetween.net/language/difference-between-parallel-and-perpendicular

Parallel vs. Perpendicular: Comparison Chart . Summary of Parallel Vs. Perpendicular. In a nutshell, the word parallel refers to two equidistant lines that will never intersect or touch each other at any point. Because the lines are equally distant, they have the same slope and the angle between them is zero.

theydiffer.com/difference-between-parallel-and-perpendicular

Parallel vs Perpendicular. What, then, is the difference between “parallel” and “perpendicular”? The word “parallel” refers to two equidistant (having the same distance) lines with the same steepness, whereas the word “perpendicular” refers to something that is positioned at a 90° angle from another thing.

grammarist.com/usage/parallel-vs-perpendicular

Parallel vs perpendicular Parallel and perpendicular are two words that are often confused with each other. We’ll look at the meaning of parallel and perpendicular , how the two words differ, their origins, and examine some examples of their use in sentences.

www.mathwarehouse.com/algebra/linear_equation/parallel-perpendicular-lines.php

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). 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 degrees.

www.mathsisfun.com/perpendicular-parallel.html

Likewise, parallel lines become perpendicular when one line is rotated 90°. Parallel Curves. Curves can also be parallel when they keep the same distance apart (called "equidistant"), like railroad tracks. The red curve is parallel to the blue curve in both these cases: Parallel Surfaces. Surfaces can also be parallel, like this: Lines and Planes.

www.mathworksheets4kids.com/parallel-perpendicular-intersecting-lines.php

Real-life objects: Parallel vs Perpendicular. Try to identify whether the pair of lines is parallel or perpendicular from the objects you are using in day-to-day life. Sheet 1 | Sheet 2 | Sheet 3. Download All; Parallel and perpendicular streets - Road map. Examine the given road map to identify parallel and perpendicular streets.

www.bbc.co.uk/bitesize/topics/zb6tyrd/articles/zp327hv

Parallel lines are always the same distance apart for their entire length. Perpendicular lines cross each other at right angles.

en.wikipedia.org/wiki/Perpendicular

The segment AB is perpendicular to the segment CD because the two angles it creates (indicated in orange and blue) are each 90 degrees. The segment AB can be called the perpendicular from A to the segment CD, using "perpendicular" as a noun. The point B is called the foot of the perpendicular from A to segment CD, or simply, the foot of A on CD.

www.khanacademy.org/.../hs-geo-parallel-perpendicular-eq/e/line_relationships

Math · High school geometry · Analytic geometry · Equations of parallel & perpendicular lines Parallel & perpendicular lines from equation CCSS Math: HSF.IF.C.8 , HSG.GPE.B.5