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Midsegment of a Trapezoid

The midsegment of a trapezoid is the segment connecting the midpoints of the two non-parallel sides.

In trapezoid A B C D below, segment P Q is the midsegment.

The length of the midsegment of trapezoid is half the sum of the lengths of the two parallel sides. In the figure above:

P Q = A B + C D 2