$\"\"$

The standard form of circle is $\"\"$ , where $\"\"$ is the center and $\"\"$ is the radius.

The equation of the circle is $\"\"$ .

Rewrite the equation as $\"\"$ .

Compare the above equation with $\"\"$ .

Center $\"\"$ and radius $\"\"$ .

$\"\"$

Center is $\"\"$ and radius is $\"\"$ .