Answer
$A=\pi r^2$
Work Step by Step
$A=kr^2$
$A=9\pi$ when $r=3$:
$9\pi=k(3^2)=9k$
$k=\frac{9\pi}{9}=\pi$
Then:
$A=\pi r^2$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 3 - 3.5 - Mathematical Modeling and Variation - 3.5 Exercises - Page 296: 54
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