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Construct a Perpendicular Line through Another Line Using a Compass

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Updated:  
2016-12-01 2:53:02
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From The Book:  
Geometry Essentials For Dummies
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Say you're given a line with a point somewhere along it, and you have to construct a second line perpendicular to the first one through that point. Can it be done? Absolutely! The following example will show you how.

geometry-construct

As you work through this construction, you can refer back to this figure:

geometry-point-perpendicular Constructing a perpendicular line through a point on a line.
  1. Using any radius r, construct arc (W, r) that intersects line EF at X and Y.
  2. Using any radius s that's greater than r, construct arc (X, s) and arc (Y, s) intersecting each other at point Z.
  3. Draw line WZ.
That's it; line WZ is perpendicular to line EF at point W.

About This Article

This article is from the book: 

About the book author:

Mark Ryan has more than three decades’ experience as a calculus teacher and tutor. He has a gift for mathematics and a gift for explaining it in plain English. He tutors students in all junior high and high school math courses as well as math test prep, and he’s the founder of The Math Center on Chicago’s North Shore. Ryan is the author of Calculus For Dummies, Calculus Essentials For Dummies, Geometry For Dummies, and several other math books.