How do you find the midpoint of a trapezoid ?

A trapezoid midsegment connects the midpoints of the two congruent sides of the trapezoid, and is parallel to the pair of parallel sides. The length of the midsegment is the sum of the two bases divided by 2. Remember that the bases of a trapezoid are the two parallel sides.

Basically u have to graph these point first the first number always X and the second one is Y and then reflected over the y-axis which is (-x,y) so,
The first coordinates is (-2,2)
The second one (-4,4)
The third one (-4,2)

I hope that helped