Trigonometry 7th Edition

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

Chapter 3 - Section 3.2 - Radians and Degrees - 3.2 Problem Set - Page 131: 21


$2.11$ radians

Work Step by Step

First convert the angle to decimal degrees: $120^{\circ}40'=120^{\circ}+(\frac{40}{60})^{\circ}=120.67^{\circ}$. Now convert to radians: $120.67^{\circ}=120.67(\frac{\pi}{180})\approx2.11$ radians.
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