A sphere cut out from a side of 7 cm cubes. Find the volume of this sphere ?
∵ Diameter of sphere equal to sides of cube
∴ Radius of sphere = 7/2 cm
Volume of sphere = 4/3πr^{3}
= 4/3 × 22/7 × 7/2 × 7/2 × 7/2
= 539/3 = 179.66 cm^{3}