Mathematics
In quadrilateral ABCD, AB//DC, then:
∠A + ∠B = 180°
∠A + ∠C = 180°
∠C + ∠D = 180°
∠A + ∠D = 180°
Quadrilaterals
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Answer
In quadrilateral ABCD, where AB//DC,
The consecutive angles between the parallel sides are supplementary.
Thus, ∠A + ∠D = 180°.
Hence, option 4 is the correct option.
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