Answer
$\approx6370.6$ km
Work Step by Step
Plugging in $S=510000000$ into the formula we get $510000000=4\pi r^2$, hence since $r$ cannot be negative: $r=\sqrt{\frac{510000000}{4\pi}}\approx6370.6$ km
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 4 Quadratic Functions and Factoring - Chapter Review - Page 320: 28
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