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131_G6U26_WB˜ ˙—» ¿º 2011.6.23 3:26 PM ˘ ` 19

131-P3-1

Construct a Bisector of an Angle

Use a ruler and a compass to construct a bisector of the following angles.

A

OB

Step 1. Place a compass point on point O and draw an arc over AOB. The
intersecting points of OA, OB, and the arc are points C and D.

A
C

O DB
Step 2. Place a compass point on points C and D to draw two arcs. The

intersecting point is point E.

A E
C

O DB

Step 3. Draw ray OE.

A
CE

O DB
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