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Mathematics 12 Online
OpenStudy (anonymous):

Jamie is writing a proof of the theorem stated below. Theorem: The sum of interior angles of a triangle is 180°. Triangle PQR with side PR extended to point S and side PQ extended to point U. Segment QT is drawn parallel to segment PS. Angle PRQ is 1, angle RPQ is 2, angle PQR is 3, angle RQT is 1, angle TQU is 2. Which theorem will he most likely use in the proof?

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