Answer
$r = 5$
Work Step by Step
$x^2+y^2 = 25$
$(r~cos~\theta)^2+(r~sin~\theta)^2 = 25$
$r^2~cos^2~\theta+r^2~sin^2~\theta = 25$
$r^2~(cos^2~\theta+sin^2~\theta) = 25$
$r^2~(1) = 25$
$r^2 = 25$
$r = 5$
Trigonometry (10th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671775
ISBN 13:
978-0-32167-177-6
Chapter 8 - Review Exercises - Page 405: 62
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