Answer
$12\pi$
Work Step by Step
The area can be obtained by subtracting the area of the circle with radius $2$ from the area of the circle with radius $4$, hence the answer: $4^2\pi-2^2\pi=16\pi-4\pi=12\pi$
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 10 - Geometry - 10.4 Area and Circumference - Exercise Set 10.4 - Page 648: 32
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