Answer
$${x^2} + {y^2} = 4$$
Work Step by Step
$$\eqalign{
& r = 2 \cr
& {\text{Square both sides}} \cr
& {r^2} = 4 \cr
& {\text{Use }}{r^2} = {x^2} + {y^2} \cr
& {x^2} + {y^2} = 4 \cr} $$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 8 - Application of Trigonometry - Chapter 8 Test Prep - Review Exercises - Page 842: 91
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