Elementary Geometry for College Students (5th Edition)

Published by Brooks Cole
ISBN 10: 1439047901
ISBN 13: 978-1-43904-790-3

Chapter 10 - Section 10.4 - Analytic Proofs - Exercises - Page 480: 24

Answer

The circle has an equation of $r^2=x^2+y^2$

Work Step by Step

We use the distance formula for a circle with a center of 0,0 to find: $r = \sqrt{(x-0)^2 + (y-0)^2 } \\ r = \sqrt{x^2+y^2 } \\ r^2 = x^2 +y^2$
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