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In triangle PQR, C is the centroid. PQ = 30 cm, QR = 36 cm and PR = 50 cm. If D is the midpoint of QR, then what is the length (in cm) of CD?

(4√86)/3
(2√86)/3
(5√86)/3
(5√86)/2

Correct Answer: (4√86)/3

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