Answer
$36^\circ$
Work Step by Step
Use the figure given in the exercise and the fact that a full circle equals to $360^\circ$, we have $5\times (2\theta)=360^\circ$ which gives $\theta=36^\circ$.
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 5 - Trigonometric Functions - 5.1 Angles - 5.1 Exercises - Page 506: 130
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