Trigonometry 7th Edition

Published by Cengage Learning
ISBN 10: 1111826854
ISBN 13: 978-1-11182-685-7

Chapter 1 - Section 1.1 - Angles, Degrees, and Special Triangles - 1.1 Problem Set: 27

Answer

1 second

Work Step by Step

One complete revolution is equivalent to $360^{\circ}$ Time taken to rotate through $360^{\circ}$ = 4 seconds Time taken to rotate through $1^{\circ}$ = $ \frac{4}{360} $ seconds Time taken to rotate through $90^{\circ}$ = $ \frac{4}{360} \times 90 $ seconds = 1 second
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