Answer
$$25\%
.$$
Work Step by Step
To find the percent, we take the ratio of $\pi/2$ to $2\pi$:
$$
\frac{\pi/2}{2\pi}\times 100=\frac{1}{4}\times100=25\%
.$$
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: 10
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