Mathematics
In a quadrilateral ABCD, side AB will be parallel to side DC, if :
∠A + ∠B = 180°
∠A = ∠B
∠D = ∠C
∠B + ∠C = 180°
Quadrilaterals Constructions
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Answer
In a quadrilateral ABCD, side AB will be parallel to side DC, if adjacent angles are supplementary.
⇒ ∠B + ∠C = 180°
⇒ ∠D + ∠A = 180°
Hence, option 4 is the correct option.
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