In triangle PQR, S and T are the midpoints of sides PQ and PR, respectively. The length of side QR is 12 cm. If ST is parallel to QR, find the length of ST in cm.

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In triangle PQR, S and T are midpoints of sides PQ and PR respectively. According to the Midsegment Theorem, the segment joining the midpoints of two sides of a triangle is parallel to the third side and its length is half the length of the third side. Given QR = 12 cm, ST = 1/2 * QR = 1/2 * 12 = 6 cm.

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