$\"\"$

The equation is $\"\"$ .

The polar coordinates are related to Cartesian coordinates by the equation $\"\"$ .

Where $\"\"$ .

Therefore we have $\"\"$ .

The equation can be written as $\"\"$ .

Compare above equation with circle standard equation $\"\"$ .

Where $\"\"$ is center of circle and $\"\"$ is the radius of circle.

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

Center of circle is $\"\"$ .

Radius of circle is $\"\"$ .

$\"\"$

The circle equation is $\"\"$ .

Center of circle is $\"\"$ .

Radius of circle is $\"\"$ .