#### Answer

$$4 \pi.$$

#### Work Step by Step

The surface will be a disk with raduis $r=2 $, so the area $A$ is $$A=\pi r^2=2^2 \pi=4 \pi.$$

Published by
W. H. Freeman

ISBN 10:
1464125260

ISBN 13:
978-1-46412-526-3

$$4 \pi.$$

The surface will be a disk with raduis $r=2 $, so the area $A$ is $$A=\pi r^2=2^2 \pi=4 \pi.$$

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