As shown in the figure, in ladder ABCD, ad ‖ BC, ∠ B = 80 °, C = 50 °, ad = 2, BC = 5. Find the length of waist ab

If a is used as am ∥ DC, then the quadrilateral AMCD is a parallelogram. ∥ cm = ad = 2, ∥ BM = bc-cm = 3, ∥ DC ∥ am, ∥ 1 = ∥ C = 50 °, ∥ 2 = 180 ° - ∥ B - ∥ 1 = 50 °, ∥ 1 = ∥ 2, ∥ AB = BM = 3

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