# Chapter 9 - Conic Sections, Sequences, and Series - 9.1 Parabolas and Circles - 9.1 Exercises - Page 702: 61

$x^2+y^2-4y=0$

#### Work Step by Step

Center=$(0,2)$ Radius=$2$ Equation: $(x-0)^2+(y-2)^2=2^2$ $\implies x^2+y^2-4y+4=4$ $\implies x^2+y^2-4y=0$

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