Answer
$3\sqrt 5$
Work Step by Step
The distance between $(-1,3)$ and $(5,-9)$ can be found as $2r=\sqrt {(-1-(5))^2+(3-(-9))^2}=\sqrt {180}=6\sqrt 5$, thus $r=3\sqrt 5$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 2 - Graphs and Functions - 2.2 Circles - 2.2 Exercises - Page 202: 56
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