As shown in the figure, given that point C is the midpoint of line AB, point D is the midpoint of BC, ab = 10cm, find the length of AD

∵ C point is the midpoint of AB, D point is the midpoint of BC, ab = 10cm, ∵ AC = CB = 12ab = 5cm, CD = 12bc = 2.5cm, ∵ ad = AC + CD = 5 + 2.5 = 7.5cm

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