Elementary Technical Mathematics

Published by Brooks Cole
ISBN 10: 1285199197
ISBN 13: 978-1-28519-919-1

Chapter 12 - Section 12.6 - Radian Measure - Exercise - Page 417: 9


$\frac{4\pi}{3} \ rad$

Work Step by Step

Since $\frac{2}{3}$ of a circle is $\frac{2}{3}\times 360=240^o$, then in radians the angle is given by: $$ 240\times \frac{\pi}{180}=\frac{4\pi}{3} \ rad .$$
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