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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

## 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.

## 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.

Once you've reviewed  how to calculate Parallel and Perpendicular Lines, you'll be ready fo this early calculus exercise that provides you with 10 questions and answers involving parallel or perpindicular lines.  Or, check out the video review prior to tackling the que... More »

## Straight-Line Equations: Parallel and Perpendicular Lines

www.purplemath.com/modules/strtlneq3.htm

Demonstrates how to find parallel and perpendicular equations through a given point.

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

At the end of the video, to show that two lines are perpendicular he uses an upside down T. My geometry teacher usually represented it as a right side up T.

## 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.

## Recognizing parallel and perpendicular lines | Interpreting angles ...

Identify parallel and perpendicular lines in geometric figures and pictures.

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

www.mathopenref.com/coordperpendicular.html

How to determine if lines are perpendicular in coordinate geometry.

Popular Q&A
Q: How to Find a Perpendicular Line.
A: 1. Write down the slope of the given line using the slope-intercept formula, y = mx + b. The term "m" is the slope. For instance, if you have the equation y = 3... Read More »
Source: www.ehow.com
Q: How to Find a Perpendicular Line.
A: Instructions. Write down the slope of the given line using the slope-intercept formula, y = mx + b. The term "m" is the slope. For instance, if you have the equ... Read More »
Source: www.ehow.com
Q: What a perpendicular lines?
A: Perpendicular lines are lines that cross each other at 90 degree angles. For example, the letter T. The lines in the letter V are not perpendicular because the ... Read More »