Asked by Thomas

Convert the rectangular equation to polar form. Assume
a > 0.

x^2 + y^2 - 9ax=0

Answered by oobleck
just crank it out
r^2 - 9arcosθ = 0
r = 9a cosθ
you know it's just a circle with center at (9a/2,0) and radius 9a/2.