#### Answer

(a, A) = { (4, 64$\pi$), (7, 91$\pi$), (10, 100$\pi$), (13, 91$\pi$), (16, 64$\pi$) }

#### Work Step by Step

Use the formula $A= \pi a (20-a) $ to find:
(a, A) = { (4, 64$\pi$), (7, 91$\pi$), (10, 100$\pi$), (13, 91$\pi$), (16, 64$\pi$) }

Published by
Cengage Learning

ISBN 10:
9781337271172

ISBN 13:
978-1-33727-117-2

(a, A) = { (4, 64$\pi$), (7, 91$\pi$), (10, 100$\pi$), (13, 91$\pi$), (16, 64$\pi$) }

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