Algebra 2 (1st Edition)

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


$\approx6370.6$ 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
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