﹙3,√3﹚
ρ=√(9+3)=2√3
θ=arcsin(√3/(2√3))=π/6
﹙0﹣,√5／3﹚
ρ=√5/3
θ=π/2
﹙7／2,0﹚
ρ=7/2
θ=0
﹙﹣2,﹣2√3﹚
ρ=√(4+12)=4
θ=arcsin(-2√3/4)=arcsin(-√3/2)=π+π/3