# How to Test Over Perpendicular Lines?

Lines of a graph are perpendicular when their angle of intersection is exactly 90 degrees. The x and y axes are perpendicular, and so are the graph's diagonals. There are several ways to measure th...
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http://www.ehow.com/how_8511212_test-over-perpendicular-lines.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

## How to Find the Slope of Perpendicular Lines?

All lines on a graph have a slope, or the angle at which it rises or falls. Slope is found by using the units on a graph. A line can have either a positive or negative slope, meaning the line eithe...
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http://www.ehow.com/how_8152568_slope-perpendicular-lines.html