Answer
$\frac{4\pi}{3} \ rad$
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:
$$
240\times \frac{\pi}{180}=\frac{4\pi}{3} \ rad
.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
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
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