Answer
circle
$(h,k)$
$r$
Work Step by Step
We want all the points $(x,y)$ that are equidistant, $r$, from $(h,k)$:
$d=\sqrt {(x-h)^2+(y-k)^2}~~$ (Square both sides and make $d=r$:
$r^2=(x-h)^2+(y-k)^2$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 4 - 4.3 - Conics - 4.3 Exercises - Page 337: 2
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