$\"\"$

The equation is $\"\"$ .

Squaring on both sides.

$\"\"$

Since $\"\"$ , the equation can be written as $\"\"$ .

The graph of this equation is a circle with a center at the origin and radius $\"\"$ .

$\"\"$

Evaluate the function for several values of $\"\"$ in its domain and use this points to graph the function.

(1) Draw the coordinate plane.

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

Graph :

$\"\"$

$\"\"$

The rectangular equation is $\"\"$ .

Graph :

$\"\"$