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en.wikipedia.org/wiki/Perpendicular

In elementary geometry, the property of being perpendicular (perpendicularity) is the relationship between two lines which meet at a right angle (90 degrees). The property extends to other related geometric objects. A line is said to be perpendicular to another line if the two lines intersect at a ... For example, by counting links, three pieces of chain can be made with ...

www.khanacademy.org/math/basic-geo/basic-geo-angle/angles-between-lines/v/identifying-parallel-and-perpendicular-lines

So all perpendicular lines are intersecting, but not all intersecting lines are perpendicular. For example, an X is made of two intersecting lines, but the angles  ...

www.khanacademy.org/math/geometry/hs-geo-analytic-geometry/hs-geo-parallel-perpendicular-eq/v/perpendicular-lines

Equivalent lines are what they say, the same lines! Let's say you're given this example: 5x+y=2 and 20x+4y=8 and you have to figure out what kind of line this is.

www.montereyinstitute.org/courses/Algebra1/COURSE_TEXT_RESOURCE/U04_L2_T2_text_final.html

Perpendicular lines are two or more lines that intersect at a 90-degree angle, like the two lines drawn on this graph, and the x and y axes that orient them.

www.shmoop.com/parallel-perpendicular-lines/perpendicular-lines-examples.html

Parallel and Perpendicular Lines ... Example 1. If two lines intersect and one of the angles formed from the intersection is 90°, what is the measurement of the ...

www.mathsisfun.com/perpendicular-parallel.html

Perpendicular and Parallel. Perpendicular. It just means at right angles (90°) to. The red line is perpendicular to the blue line in each of these examples:.

www.splashmath.com/math-vocabulary/geometry/perpendicular-lines

Definition of Perpendicular Lines explained with illustrated examples. Also, practice lots of math problems with fun math worksheets at Splash Math.

study.com/academy/lesson/perpendicular-slope-definition-examples.html

Review what perpendicular lines are and what the slope of a line is. Learn about the relationship between slopes of perpendicular lines through...

study.com/academy/lesson/perpendicular-angles-definition-examples.html

Perpendicular lines and surfaces show up all the time in the world around us. This lesson will allow us to become familiar with these concepts. ...