## Trigonometry 7th Edition

Published by Cengage Learning

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

#### Answer

$60^{\circ}$

#### 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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