Answer
$A = 4\pi r^3$
Work Step by Step
Volume of a cylinder is $\pi r^2h$, r=radius, h=height
In the problem, it is given that the height is four times the radius, so $h = 4r$
$A = \pi r^2h$
$A = \pi r^2 (4r)$
$A = 4\pi r^3$
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 2 - Review - Modeling with Functions - Problems - Page 240: 4
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