Answer
$\dfrac{-5 \pi}{4}$
Work Step by Step
$\because 1 \text{ degree } = \dfrac{\pi}{180} \text{ radians}$
$\therefore -225^{\circ} = -225 \times \dfrac{\pi}{180} = \boxed{\dfrac{-5 \pi}{4}} \text { radians}$
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 - Section 5.1 Angles and Their Measures - 5.1 Assess Your Understanding - Page 386: 44
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