Answer
$-22.5^{\circ}$
Work Step by Step
In order to convert the value from radians to degrees, we multiply by $\dfrac{180^{\circ}}{\pi}$.
Therefore
$\dfrac{-\pi}{8}\text{radians} \\=\dfrac{-\pi}{8} \times \dfrac{180^{\circ}}{\pi} =-225^{\circ}$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 5 - Trigonometric Functions - Chapter Test - Page 460: 4
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