Answer
$\frac{4\pi}{5} \ rad$
Work Step by Step
The number of radians in the given central angle is
$$
360\times\frac{2}{5} \times\frac{\pi}{180} \ rad=\frac{4\pi}{5} \ rad
.$$
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 418: 11
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