In triangle PQR, M is the midpoint of ¯QR. Find PM. PQ = 5, PR = 8, QR = 11
By the Pythagorean Theorem, PQ2+PR2=QR2, so 52+82=112.
Thus △PQR is a right triangle where PQ is the hypotenuse, so by the Pythagorean Theorem, PM2=(2PR)2=(28)2=16.
Hence, PM=16=4.
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