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In trapezoid ABCD, sides AB and CD are paralllel, A = 2D and C = 3B + A.  Find B.

 May 8, 2021
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In trapezoid ABCD, sides AB and CD are parallel, A = 2D and C = 3B + A.  Find B.

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∠A + ∠D = 180º

2D + D = 180 

∠A = 120º

∠D = 60º

∠B + ∠C = 180º

B + 3B + 2D = 180

4B = 60

B = 15

 May 9, 2021

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