Answer
$S=4 \pi r^2$
Work Step by Step
Since the surface area $S$ of a sphere is $4$ times $\pi$ times the square of the radius $r$, then we have
$$
S=4 \pi r^2
.$$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Appendix A - Review - A.1 Algebra Essentials - A.1 Assess Your Understanding - Page A12: 136
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