Answer
$\pi$ is not a variable, but a constant.
Work Step by Step
Correct analysis:
"$S$ varies directly as the square of $r$."
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 297: 77
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