Answer
$x^2+y^2=1$
Work Step by Step
$(x – h)^2 + (y – k)^2 = r^2$ is the general equation seen for a circle where $r$ is the radius, and $(h,k)$ is the center. Matching gives $h=0, k=0, r=1$ or $(x )^2 + (y)^2 = 1^2$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 13, Trigonometric Ratios and Functions - Prerequisite Skills - Page 850: 3
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