Answer
$A=\pi a(20-a)$
Work Step by Step
$A=\pi ab$ (area of an ellipse)
$A=\pi a(20-a)$ (as a+b=20 hence b=20-a)
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 1 - P.S. Problem Solving - Page 157: 3a
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