As shown in the figure, line AB = 8cm, C is the point on line AB, AC = 3.2cm, M is the midpoint of AB, n is the midpoint of AC. (1) find the length of line cm; (2) find the length of line Mn

(1) From ab = 8, M is the midpoint of AB, so am = 4, AC = 3.2, so cm = AM-AC = 4-3.2 = 0.8 (CM), so the length of segment cm is 0.8cm; (2) because n is the midpoint of AC, so NC = 1.6, so Mn = NC + cm, 1.6 + 0.8 = 2.4 (CM), so the length of segment Mn is 2.4cm

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