Question

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Answer 1

∠a and ∠b are supplementary angles.
If ∠a is reduced, then ∠b should be increased by the same measure so that this angle
pair remains supplementary.

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Answer 2

If two angles ∠A and ∠B are supplementary,

and if ∠A is decreased then ∠B should INCREASE

For example

∠A is 100° and ∠B 80°

∠A is decreased , so let it be  80°

then∠ B will be 180° - 80° = 100°

so, ∠B increased

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