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Verified Answer :

JeanaShupp

Answer: d. right angles.

Step-by-step explanation:

  • If the sum of two angles is \(180^{\circ}\), then they are called as supplementary angles.
  • If two angles are equal then they are said to be congruent.

Let a and b be two angles which are congruent and supplementary

Then a=b [congruent]

And \(a+b=180^{\circ}\)

\(2a=180^{\circ}\\\Rightarrow a=90^{\circ}\)

Hence, the angles  that are congruent and supplementary must be right angles.

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