Geometry For Dummies, 3rd Edition
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To bisect an angle, you use your compass to locate a point that lies on the angle bisector; then you just use your straightedge to connect that point to the angle's vertex.

Try an example.

geometry-angle-bisect

Refer to the figure as you work through this construction:

geometry-bisecting

  1. Open your compass to any radius r, and construct arc (K, r) intersecting the two sides of angle K at A and B.
  2. Use any radius s to construct arc (A, s) and arc (B, s) that intersect each other at point Z. Note that you must choose a radius s that's long enough for the two arcs to intersect.
  3. Draw line KZ and you're done.

About This Article

This article is from the book:

About the book author:

Mark Ryan is the founder and owner of The Math Center in the Chicago area, where he provides tutoring in all math subjects as well as test preparation. Mark is the author of Calculus For Dummies, Calculus Workbook For Dummies, and Geometry Workbook For Dummies.

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