Geometry

Question Analysis

This question involves the concept of complementary angles.

Key Concept Explanation

Complementary angles are two angles whose measures add up to 90 degrees. This is a fundamental geometric relationship used to determine an unknown angle when one of the pair is given.

Step - by - Step Solution

1. Recall the property of complementary angles:

Let the given angle be , and the complement be . The formula for finding the complement is .

2. Substitute the value of  into the formula:

.

Option Analysis

A.151 degrees: If we add 39 degrees and 151 degrees, we get