Trigonometry (10th Edition)

by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie

Published by Pearson

ISBN 10: 0321671775

ISBN 13: 978-0-32167-177-6

Chapter 1 - Trigonometric Functions - Section 1.2 Angle Relationships and Similar Triangles - 1.2 Exercises - Page 15: 3

Answer

51°

Work Step by Step

1. Vertical angles are congruent 5x -129 = 2x -21 2. Solve the equation to find x: 5x-2x= 129-21 3x=108 x=36 3. Plug x into one of the angles to find the angle itself: 5(36)-129= 51

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