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Perpendicular lines are those that form a right angle at the point at which they intersect. Parallel lines, though in the same plane, never intersect....

What Are Perpendicular Lines?
In mathematics, a line is an infinitely long one-dimensional object. It has no start or end, continuing on forever without ever changing direction. More colloquially, a "line" is any straight object, even if it does have an end point. The relationship... More »
Difficulty: Easy
Source: www.ehow.com

## Slope: Parallel and Perpendicular Lines - Purplemath

www.purplemath.com/modules/slope2.htm

Demonstrates how to determine if slopes are parallel, perpendicular, or neither. Explains why graphing is not generally helpful for this type of question.

## Definition of Perpendicular Lines - Math is Fun

www.mathsisfun.com/definitions/perpendicular-lines.html

Perpendicular Lines. more ... Perpendicular Lines. Lines that are at right angles ( 90°) to each other. Try for yourself: See: Parallel Lines. Next.

Perpendicular lines or line segments More »

## Identifying parallel and perpendicular lines | Relationships between ...

Let's now apply what we learned and do an exercise together in which we identify parallel and perpendicular lines.This is great practice.

## Perpendicular Lines 1 | Coolmath.com

www.coolmath.com/algebra/08-lines/14-perpendicular-lines-01

Let's graph these lines: * I'm using y = mx + b stuff to graph them!

## Equations of parallel and perpendicular lines ... - Khan Academy

Determine the equation of a line parallel or perpendicular to the given line. Determine the relationship between two linear equations.

## Perpendicular lines. (Coordinate Geometry) - Math Open Reference

www.mathopenref.com/coordperpendicular.html

How to determine if lines are perpendicular in coordinate geometry.

## IXL - Slopes of parallel and perpendicular lines (Algebra 1 practice)

www.ixl.com/math/algebra-1/slopes-of-parallel-and-perpendicular-lines

Fun math practice! Improve your skills with free problems in 'Slopes of parallel and perpendicular lines' and thousands of other practice lessons.

Popular Q&A
Q: How to Find a Perpendicular Line.
A: If a line intersects another line at a 90-degree angle, they are perpendicular. You may have to find a perpendicular line as a part of a high school or college ... Read More »
Source: www.ehow.com
Q: What Are Perpendicular Lines?
A: In mathematics, a line is an infinitely long one-dimensional object. It has no start or end, continuing on forever without ever changing direction. More colloqu... Read More »
Source: www.ehow.com
Q: What are parellel and perpendicular lines?
A: Parralell lines are lines that run together and will never meet. For example: _ _ Perpendicular lines are lines that run at a 90 degree angle to each other. For... Read More »