Given that the line segments ad = 6cm, AC = 4cm, BD = 4cm, e and F are the midpoint of AB and CD respectively, how many centimeters is ef?

Analysis: D is the midpoint of the line AC, the line AD and line CD are half of the line AC, and the result is 2.5;
Because BC = AB-AC = 9-5 = 4, and E is the midpoint of CB,
So the segment CE is half of the segment CB, and the result is 2,
So the length of segment De is the sum of segment CD and segment CE, and the result is 4.5

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