As shown in the figure, we know that B and C are two points on the line ad, e is the midpoint of AB, f is the midpoint of CD, ad = 18am, BC = 5cm (1) Find AB + CD; (2) find the distance between E and F

AB+CD=AD-BC=18-5=13cm；EF=12（AB+CD）+BC=12×13+5=11.5cm．

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