Question

(-2,3) and (-2,1) what is the answer

Answer 1

There is not enough info to answer this question.

Answer 2

The general formula is a^2 + b^2 = c^2.
So for this case,
a = -2-(-2) = 0
b = 3-1 = 2
Therefore c^2 = 2^2 = 4.
And your answer c = 2