Точки М и N являются серединами сторон АВ и ВС треугольника АВС, сторона АВ равна 48, сторона ВС равна 57, сторона АС равна 72. Найдите MN.

According to the midpoint theorem, the segment connecting the midpoints of two sides of a triangle is parallel to the third side and is half the length of the third side. In triangle ABC, M is the midpoint of AB and N is the midpoint of BC. Therefore, MN is parallel to AC and MN = 1/2 * AC. Given AC = 72, MN = 1/2 * 72 = 36.