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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 ...

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.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.mathsisfun.com/algebra/line-parallel-perpendicular.html

How to use Algebra to find parallel and perpendicular lines. ... Example: Find the equation of the line that is: parallel to y = 2x + 1; and passes though the point (5 ...

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.

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.homeschoolmath.net/teaching/g/parallel_and_perpendicular.php

This lesson explains what are parallel and perpendicular lines and has varied ... For example, l ∥ m means l is parallel to m, and AB ⊥ CD means AB is ...