Construct an angle whose measure is the measure of .
Note: Drag the green points to try different angles.

Copy the angle and label the vertex .

Make a large arc intersecting the sides of .

Find a point that is equidistant from both sides of .

Draw the angle bisector.
is congruent to .
The measure of is the measure of .
The measure of is the measure of .

Find a point that is equidistant from both sides of .

Draw the angle bisector.
Do not erase any of your markings.
is congruent to .
is the measure of .

This applet is provided by Walch Education as supplemental material for their mathematics programs. Visit www.walch.com for more information on their resources.