Answer:
Yes, if angles are supplementary if and only if their measure sum to 180 degrees.
Explanation:
We are given definition of supplementary angles
Supplementary angles are two angles whose measures sum to 180 degrees.
We have to find that definition of supplementary angles is reversible or not.
If yes , then we have to write in true bi-conditional.
If sum of two angles is equal to 180 degrees then the angles are supplementary angles.
If the angles are supplementary then their sum is equal to 180 degrees.
Therefore, it is reversible.
Biconditional statement: if p, then q and if q, then p.

Answer: Yes, if angles are supplementary if and only if their measure sum to 180 degrees.