The Cartesian coordinates of a point are given. (i) Find polar coordinates

The Cartesian coordinates of a point are given. (i) Find polar coordinates (r, θ) of the point, where r > 0 and 0 ≤ θ <2π. (ii) Find polar coordinates (r, θ) of the point, where r < 0 and 0 ≤ θ <2π. (2, -2)