# How Can You Determine if Two Lines Are Perpendicular in Algebra?

The graph of two intersecting perpendicular lines creates four easily identifiable equal quadrants with four identical 90-degree angles. Unfortunately, going through the graphing process for every ...
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http://www.ehow.com/how_8142785_can-two-lines-perpendicular-algebra.html

## Ways to Make Parallel Lines & Perpendicular Lines?

According to Euclid, a straight line goes on forever. When there is more than one line in a plane, the situation becomes more interesting. If two lines never intersect, the lines are parallel. If t...
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http://www.ehow.com/info_8071696_ways-parallel-lines-perpendicular-lines.html

## How to Create Perpendicular Lines?

Perpendicular lines intersect each other to create four 90-degree angles. While it would be fairly easy to create some lines that are roughly perpendicular, if you want to create perfectly perpendi...
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http://www.ehow.com/how_8456578_create-perpendicular-lines.html

## How to Draw Perpendicular Lines in Geometry?

This is how to draw perpendicular lines. It's quite easy to do, and you have probably accidentally done it before. All you need is a piece of paper and a pencil. If you don't know what this is, I w...
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http://www.wikihow.com/Draw-Perpendicular-Lines-in-Geometry

## A Description of Parallel & Perpendicular Lines?

Euclid discussed parallel and perpendicular lines over 2,000 years ago, but the complete description had to wait until Rene Descartes put a framework on Euclidean space with the invention of Cartes...
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http://www.ehow.com/info_8482042_description-parallel-perpendicular-lines.html