It is known that the line segment ad = 10 cm, the line segment AC = BD = 7 cm, e and F are the midpoint of the line segments AB and CD respectively, and the length of EF is calculated
AB = CD = 3cm
E is the midpoint of AB, so AE = 1.5cm. Similarly, FD = 1.5cm
So EF = ad-ae-fd = 10-1.5-1.5 = 7cm
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