Calculus (3rd Edition)

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


$$ r=3.$$

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 $$ r=3.$$
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.