The pair of angles must be supplementary are ∠1+∠2+∠3, ∠3+∠4,∠4+∠5 and ∠1+∠2+∠5.
What is supplementary angle?
Two angles are called supplementary when their measures add up to 180 degrees.
∠1+∠2+∠5=180 (linear pair)
and, ∠4+∠5=180
also, ∠3+∠4=180
∠1+∠2+∠3=180
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