$\"\"$

The polar equation is $\"\"$ .

To transform the equation to rectanglular coordinates, multiply each side by $\"\"$ .

$\"\"$ .

Apply formula : $\"\"$ .

$\"\"$ .

Apply formula : $\"r$ .

$\"\"$

Add $\"\"$ to each side.

$\"\"$

Graph :

(1) Draw the polar coordinate plane.

(2) Graph the equation $\"\"$ .

Graph of $\"\"$ :

$\"\"$

Observe the graph :

$\"\"$ ,the equation is a circle, with radius $\"\"$ , and center $\"\"$ .

$\"\"$

$\"\"$ ,the equation is a circle, with radius $\"\"$ , and center $\"\"$ .

Graph of $\"\"$ :

$\"\"$