The number of pairs of adjacent angles of a quadrilateral is [[1]].

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answer is 4.

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Detailed Solution

The number of pairs of adjacent angles of a quadrilateral is four.
We know that the angles of a quadrilateral which have a common side are known as adjacent angles.
Consider the quadrilateral, ABCD where

∠ B A D

and

∠ C D A

are adjacent angle. Since they are corresponding to the same side A D .
Question Image

Similarly

∠ A B C

and

∠ D C B

are adjacent as they are related to same side B C
Hence, there exist exactly four adjacent angle in a quadrilateral for each sides.

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