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A sphere cut out from a side of 7 cm cubes. Find the volume of this sphere ? 

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∵   Diameter of sphere equal to sides of cube

∴  Radius of sphere = 7/2 cm

Volume of sphere = 4/3πr3

= 4/3 × 22/7 × 7/2 × 7/2 × 7/2

= 539/3 = 179.66 cm3

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