Question

Give three additional polar coordinate pairs for the
Point B: (-3,2π/3).
-2 < π < 2

Answer 1

your statement -2 < π < 2 makes no sense, it simply becomes a false statement:
-2 < 3.14.. < 2

I will assume you meant:
-2π < Ø < 2π

the obvious one:
(3,-4π/3)

2 more:
(3,-π/3) , (3,5π/6)