Answer
$S=4\pi r^2$.
Work Step by Step
The surface area of a sphere is $S$ while the radius is $r$,
The surface area is $4$ times $\pi$ times the square of the radius hence
$S=4\pi r^2$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Appendix A - Review - A.1 Algebra Essentials - A.1 Assess Your Understanding - Page A13: 138
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