Geometry

Question Analysis

This question involves the concept of an angle bisector.

Key Concept Explanation

An angle bisector is a ray that divides an angle into two equal - measure angles. So, if a ray bisects an angle, the two angles formed by the bisector have the same measure, and the measure of the original angle is the sum of these two equal - sized sub - angles.

Step - by - Step Solution

1. Recall the property of an angle bisector. Since  bisects , we know that .

2. Given that , then

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