Segment AB = 20cm, point C is the point on segment AB, m and N are the midpoint of segment AC and BC respectively. Find the length of segment Mn

Answer: (1) 10 cmmn = MC + CN = (1 / 2 AC) + (1 / 2 CB) = 1 / 2 (AC + CB) = 1 / 2 ab = 1 / 2 * 20 = 10 cm (2) the length of Mn is a / 2Mn = MC + CN = (1 / 2 AC) + (1 / 2 CB) = 1 / 2 (AC + CB) = 1 / 2 AB, that is, Mn is half of ab. (3) Mn = MB + BN = (AB-1 / 2 AC) + (AB + 1 / 2BC) = 2ab-1 / 2 (ac-bc)

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