Geometry

Question Analysis

This question involves the concept of supplementary angles.

Key Concept Explanation

Supplementary angles are two angles whose combined measure equals 180°. This relationship is fundamental in geometry for analyzing angle pairs.

Step - by - Step Solution

1. Let the supplementary angle be .

2. According to the definition of supplementary angles, we set up the equation .

3. To solve for , we subtract 69 degrees from both sides of the equation: .

4. , so .

Option Analysis

A.121 degrees: Incorrect. Since

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