Question

How do you convert `x^2 + y^2 – 9y = 0` into polar form?

Answer 1

r = 9 sin `theta`

Explanation:

Use x.x + y.y = r.r. and y =r sin `theta`.
r = 9 sin `theta` represents the circle through r = 0, with center at ( 9/2, `pi`/2 ) and radius 9/2.. The line `theta` = 0, touches the circle at r = 0.