Answer
$r = \sqrt {\frac{A}{\pi}}$
Work Step by Step
Area of a circle is $A = \pi r^2$
Solve for r (radius)
$\frac{A}{\pi} = r^2$
$r = \sqrt {\frac{A}{\pi}}$
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 2 - Review - Modeling with Functions - Problems - Page 240: 9
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