Melissa believes that the AA similarity theorem can prove that the triangles are similar. Which fact would be necessary in the proof?

The AA similarity theorem works when two pairs of corresponding angles are congruent. If the proof establishes two angle pairs, the fact that each triangle’s interior angles sum to 180° can show that the remaining angles are congruent as well. Thus, the necessary fact is that the sum of a triangle’s interior angles is 180°.

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