## Algebra 2 (1st Edition)

Published by McDougal Littell

# Chapter 4 Quadratic Functions and Factoring - Chapter Review - Page 320: 28

#### 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

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