Question

In each part, a point is given in rectangular coordinates. Find
two pairs of polar coordinates for the point, one pair satisfying
r ≥ 0 and 0 ≤ θ < 2π, and the second pair satisfying
r ≥ 0 and −2π < θ ≤ 0.
(a) (-8, -8)

Answer 1

I cant understand the conditions! And how to solve it?