Answer
$r = + \sqrt {\frac{A}{\pi}}, -\frac{A}{\pi}$
Work Step by Step
$A = \pi r^2$
$\frac{A}{\pi} = r^2$
$r = + \sqrt {\frac{A}{\pi}}, -\frac{A}{\pi}$
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 1 - Equations and Inequalities - 1.4 Quadratic Equations - 1.4 Exercises - Page 122: 72
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