Answer
$$ r=3.$$
Work Step by Step
Recall the equation for a circle with center $(h,k)$ and radius $r$:
$(x-h)^2+(y-k)^2=r^2$
We have $ r^2=9$, so the radius is
$$ r=3.$$
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 1 - Precalculus Review - 1.1 Real Numbers, Functions, and Graphs - Preliminary Questions - Page 9: 7
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