Answer
r=$\sqrt \frac{A}{\pi}$
Work Step by Step
We use the formula for the area of a circle to obtain:
A=$\pi$$r^{2}$
$\frac{A}{\pi}$=$r^{2}$
$\sqrt \frac{A}{\pi}$=r
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 11 - Surface Area and Volume - Algebra Review - Page 698: 3
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