# Chapter 2 - Reasoning and Proof - 2-6 Proving Angles Congruent - Practice and Problem-Solving Exercises - Page 124: 9

Each of the labeled angles measures 60.

#### Work Step by Step

In exercise 6 we found that $x=20$. Substitute to find the measure of the labeled angles. $3x=3(20)=60$ $80-x=80-20=60$

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.