which pairs of angles are supplementary

Two angles ∠2 and ∠4 are the supplementary angles.
The supplementary angles are defined as the angles whose sum is equal to 180°.We can see from the given figure that the sum of the angles ∠2 and ∠4 are equal to 180 so these two angles are called the supplementary angles.
Therefore two angles ∠2 and ∠4 are the supplementary angles.
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