The height of an isosceles trapezoid, drawn from the top of an obtuse angle, divides the larger base into two segments, the smaller of which is equal to the half-difference of the bases, and the larger half-sum. Then the segment KD is equal in magnitude to the middle line of the trapezoid.
MP = KD = 11 cm.
Answer: The middle line of the trapezoid is 11 cm.
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