Answer
$r = 2$
Work Step by Step
$x^2+y^2 = 4$
$(r~cos~\theta)^2+(r~sin~\theta)^2 = 4$
$r^2~cos^2~\theta+r^2~sin^2~\theta = 4$
$r^2~(cos^2~\theta+sin^2~\theta) = 4$
$r^2~(1) = 4$
$r^2 = 4$
$r = 2$
Trigonometry (11th Edition) Clone
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
978-0-13-421743-7
ISBN 13:
978-0-13421-743-7
Chapter 8 - Review Exercises - Page 411: 70
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