#### Answer

a) $90\pi$
b) $90\pi$

#### Work Step by Step

a) The radius is 5, and the height is 9, so we obtain:
$A = 2\pi rh = 2\pi (5)(9) = 90\pi$
b) The radius is 9, and the height is 5, so we obtain:
$A = 2\pi rh = 2\pi (9)(5) = 90\pi$

Published by
Brooks Cole

ISBN 10:
1439047901

ISBN 13:
978-1-43904-790-3

a) $90\pi$
b) $90\pi$

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