1. The problem statement, all variables and given/known data I identify the curve by finding a Cartesian equation for the curve. 2. Relevant equations r = 3sin(θ) 3. The attempt at a solution r^2 = 3r(y/r) x^2+y^2 = 3y x^2-3y+y^2 = 0 Now I'm stuck, I don't remember how to complete the square as I haven't done it in ages.