What special name can be given to a quadrilateral PQRS if

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Question:
What special name can be given to a quadrilateral PQRS if ∠P + ∠S = 180°?

Solution:

Since, in quadrilateral PQRS, ∠P + ∠S = 180°.

i.e. the sum of adjacent angles is 180 $° "> °$ .

So, PQRS is a parallelogram.