## Thinking Mathematically (6th Edition)

Published by Pearson

# Chapter 10 - Geometry - 10.1 Points, Lines, Planes, and Angles - Exercise Set 10.1: 11

#### Answer

$65^o$

#### Work Step by Step

The two angles are complementary. Thus, the sum of the unknown angle and the 25-degree angle is 90 degrees. Thus, to find the measure of the unknown angle, subtract 25 degrees from 90 degrees to obtain: $=(90-25)^o \\=65^o$

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