As shown in the figure, points E and F are the midpoint of line segments AC and BC respectively. If EF = 3cm, then line segment ab=______ Cm

∵ points E and F are the middle points of line segments AC and BC respectively, ∵ CE = 12ab, BF = 12bc, ∵ EF = ce-cf = 12ac-12bc = 12 (ac-bc) = 3, ∵ ac-bc = 6, that is ab = 6

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