Geometry

Question Analysis

This question involves the angle - addition postulate and the concept of a straight angle. The main focus is on determining the value of using the relationship between the given angles.

Key Concept Explanation:

The angle - addition postulate states that if point lies in the interior of , then . A straight angle, , has a measure of .

Step - by - Step Solution:

1. Set up the equation based on the angle - addition postulate:

Since , , and , we substitute these values into the equation

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