Answer
See below.
Work Step by Step
In the polar coordinate system, $r$ is the directed distance on the terminal side of an angle $\theta$, which has its vertex is at the pole and who has its initial side along the polar axis .
Trigonometry 7th Edition
by McKeague, Charles P.; Turner, Mark D.
Published by
Cengage Learning
ISBN 10:
1111826854
ISBN 13:
978-1-11182-685-7
Chapter 8 - Section 8.5 - Polar Coordinates - 8.5 Problem Set - Page 457: 2
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