Question: Let P. Q, and R be collinear points such that P-Q-R and let S and T be two distinct points that lie in the

Let P. Q, and R be collinear points such that P-Q-R and

Let P. Q, and R be collinear points such that P-Q-R and let S and T be two distinct points that lie in the same half-plane bounded by PO such that S is in the interior of ZPQT. See the figure below. Prove that m/PQS+m/SQT +mZTQR = 180. R

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