The pair of angles that must be supplementary, in the diagram given is: ∠2 and ∠5.
What are Supplementary Angles?
Supplementary angles are two angles whose sum equals to 180 degrees.
m∠2 + m∠5 = 180° (each equals 90°)
Therefore, the pair of angles, ∠2 and ∠5 are supplementary angles in the diagram given because their sum equals 180 degrees.
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