This is the lower part of the shape, we must find the height of both shapes
The heights of both shapes are the same since the opposite sides are equal
for th lower shape drawn h, the height =
The
so MN = 1/2(AB + DC)
MN = 27
AB = ?
DC = 32
Substituting
27 = 1/2(AB + 32)
27 = AB/2 + 32/2
27 = AB/2 + 16
2 x 27 = 2 x AB/2 + 2x16
54 = AB + 32
AB = 54-32
AB = 22