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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
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
