Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 1 - P.S. Problem Solving - Page 157: 3a


$A=\pi a(20-a)$

Work Step by Step

$A=\pi ab$ (area of an ellipse) $A=\pi a(20-a)$ (as a+b=20 hence b=20-a)
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