Question

Write the polar equation in rectangular form. (t = theta)

r = 3 cos t

A. x2 + y2 = 3

B. x2 + y2 = 3r

C. x2 + y2 = 9

D. x2 + y2 = 3x

Answer 1

you want to substitute x =rcost and y=rsint somehow into the equation if convenient. one way is multiply each side by r so you get r^2=3rcost. also remember r^2 =x^2+y^2 so simple substitution gives x^2 +y^2 =3x

Answer 2

this is greatr thanks!!!!