Geometry

Question Analysis

This question involves the concept of supplementary angles.

 

Key Concept Explanation

Supplementary angles are two angles whose sum is 180°. When two angles form a linear pair (lie on a straight line), they are supplementary.

 

Step-by-Step Solution

1. Let the missing angle be .

2. We know that the given angle is 71°.

3. Since the two angles form a linear pair, we can set up the equation .

4. To solve for , we subtract 71° from both sides of the equation: .

 

Option Analysis

A.29: Incorrect. If , then .

B.39: Incorrect. If

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