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.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 ...

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. ...