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a blacksmith has a rectangular iron sheet with the length of 10 cm. he has to cut out 7 circular disc of radius 1 cm. what is the minimum width of that rectangular sheet?

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Diameter = 2 cm, so 2 cm width would only get 5 disks. Thus 4cm is minimum, but will get 10 disks.

3.4 minimum width
3.39974.......

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