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OpenStudy (anonymous):
Cynthia is writing a proof of the theorem stated below. Theorem: The sum of interior angles of a triangle is 180°. She first drew the figure shown below. Which theorem will she most likely use in the proof? Vertical angles are congruent. Alternate Interior Angles formed by parallel lines and their transversal are complementary. If two angles form a straight angle, then they are supplementary. Corresponding angles formed by parallel lines and their transversal are supplementary.
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