$\"\"$

Polar equation is $\"\"$ .

$\"\"$ .

Substitute $\"\"$ and $\"\"$ in the above expression.

$\"\"$

Divide on each side by 12.

$\"\"$

Above equation is in rectangular form and it is an ellipse with center $\"\"$ .

$\"\"$

Rectangular form is $\"\"$ and it is an ellipse with center $\"\"$ .