Answer
A sphere with center at the origin and radius 2.
Work Step by Step
$x^2+y^2+z^2 = r^2$ is the given formula for a sphere with center at the origin. With that information given, we find the radius to be $r= \sqrt(r^2)= \sqrt 4 = 2$
Calculus: Early Transcendentals 8th Edition
by Stewart, James
Published by
Cengage Learning
ISBN 10:
1285741552
ISBN 13:
978-1-28574-155-0
Chapter 12 - Section 12.1 - Three-Dimensional Coordinate Systems - 12.1 Exercises - Page 797: 33
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