As shown in the figure, points E and F are the midpoint of line segments AC and BC respectively. If EF = 2.5cm, calculate the length of line segment ab

∵ E and F are the midpoint of AC and BC, respectively, ∵ EC = 12ac, FC = 12bc, ∵ EF = ec-fc = 12ac-12bc = 12 (ac-bc) = 12ab = 2.5cm, ∵ AB = 5cm

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