Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 5 - Trigonometric Functions - 5.1 Angles - 5.1 Exercises - Page 504: 28


$(9x)^\circ=90^\circ$ $(9x)^\circ=90^\circ$

Work Step by Step

The sum of the two angles is a straight angle ($180^\circ$): $(9x)^\circ+(9x)^\circ=(18x)^\circ=180^\circ$ $x=10$ $(9x)^\circ=90^\circ$ $(9x)^\circ=90^\circ$
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