# Features of a circle from its expanded equation

Find the center and radius of a circle given the equation in expanded form.

### Problem

A certain circle can be represented by the following equation.
x, start superscript, 2, end superscript, plus, y, start superscript, 2, end superscript, plus, 6, y, minus, 72, equals, 0
What is the center of this circle ?
left parenthesis
comma
right parenthesis
What is the radius of this circle ?
units
Get 3 answers correct in a row