In trapezoid ABCD, sides AB and CD are parallel, ∠A = 2∠D, and ∠C = 3∠B. Find ∠A.
Since AB and CD are parallel
Then angles A and D are supplemental ....so
A + D = 180
2D + D = 180
3D = 180
D = 60
And A = 2D = 2(60) = 120°
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