Answer
$A=\pi a (20-a)$
Work Step by Step
We will use the constraint $a+b=20
$ to write $A$ in terms of $a$.
So, $A=\pi a b$
Therefore, $A=\pi a (20-a)$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 4 - 4.3 - Conics - 4.3 Exercises - Page 340: 88a
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