## Algebra 2 (1st Edition)

Published by McDougal Littell

# Chapter 13, Trigonometric Ratios and Functions - 13.2 Define General Angles and Use Radian Measure - 13.2 Exercises - Skill Practice - Page 863: 20

#### Answer

$\dfrac{5 \pi}{6}$ and $\dfrac{-19\pi}{6}$

#### Work Step by Step

a) Need to add $2 \pi$ to the given radian measurements. Thus, we have $\dfrac{-7 \pi}{6}+2 \pi=\dfrac{-7 \pi}{6}+\dfrac{12 \pi}{6}$ $=\dfrac{5\pi}{6}$ b) Need to subtract $2 \pi$ to the given radian measurements. Thus, we have $\dfrac{-7 \pi}{6}-2 \pi=\dfrac{-7 \pi}{6}-\dfrac{12 \pi}{6}$ $=\dfrac{-19\pi}{6}$

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