$\"\"$

The equation is $\"\"$ .

The condition is $\"\"$ .

Consider $\"\"$ .

Multiply each side by $\"\"$ .

$\"\"$

Use the formulas : $\"\"$ and $\"\"$ .

$\"\"$

Add $\"\"$ to each side.

$\"\"$

The equation represents a circle of radius $\"\"$ , with center at $\"\"$ in rectangular coordinates.

$\"\"$

The graph of the equation $\"\"$ is with circle radius $\"\"$ , with center at $\"\"$ in

rectangular coordinates.