Answer
$r=\sqrt \frac{S}{3\pi}$
Work Step by Step
Obtain: $S=3\pi r^2$
Solve for r: $r^2=\frac{S}{3\pi}\\r=\sqrt \frac{S}{3\pi}$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 6 Rational Exponents and Radical Functions - Standardized Test Practice - Extended Response - Page 472: 4a
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