Trapezium is a quadrilateral with

one pair of opposite sides parallel

Here, AB ∥ CD

Thus, sum of adjacent angles in trapezium is 180°

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Property:
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Adjacent angles of Trapezium are supplementary

i.e. ∠ A + ∠ D = 180°

∠ B + ∠ C = 180°

Let’s look at its proof

Thus, sum of adjacent angles in trapezium is 180°