Answer
$18^{\circ}$
Work Step by Step
We know that-
$1$ rad = $(\frac{180}{\pi})^{\circ}$
Therefore
$\frac{\pi}{10}$ rad = $(\frac{\pi}{10}\times\frac{180}{\pi})^{\circ}$
= $18^{\circ}$
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 6 - Section 6.1 - Angle Measure - 6.1 Exercises - Page 478: 25
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