The room is [[$ 4.0 $]] m wide, [[$ 6.5 $]] m long and [[$ 3.5 $]] m high. How far is a lamp in the middle of the roof from the farthest corner of the floor? (Source: Finnish matriculation exam, spring 1986)

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Answer: The distance between the lamp in the middle of the roof and the farthest corner of the floor is m.