In the given figure, ∠1 and ∠2 are supplementary angles. If ∠1 is decreased, what
changes should take place in ∠2 so that both the angles still remain supplementary.
It is given in the question that,
∠1 and ∠2 are supplementary angles
And if ∠1 is decreased than ∠2 must be increased by the same measure so that the pair of both the angles remains supplement