Trigonometry 7th Edition

Published by Cengage Learning
ISBN 10: 1111826854
ISBN 13: 978-1-11182-685-7

Chapter 1 - Section 1.2 - The Rectangular Coordinate System - 1.2 Problem Set - Page 25: 65



Work Step by Step

Supplement of $120^{\circ}$ will be another angle that terminal side needs to sweep in order to reach at standard position of $180^{\circ}$. (Figure 24) Obviously it will be $60^{\circ}$. Another way to find supplement of an angle will be to subtract it from $180^{\circ}$. Hence supplement of $120^{\circ}$ = $180^{\circ}$- $120^{\circ}$ = $60^{\circ}$
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