The following is a special trapezoid. given ab is parallel to dc and m∠a = 110° find the measure of ∠d.

The interior measure should add up to 360 degrees. Given that AB and DC are parallel, that makes angles A and C equal. If A is 110 degrees, double that and you get 220. 360-220=140. Divide 140 by 2 and you get 70 degrees. This is the measurement of both angles B and D. So 70 degrees is your answer!

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