a spherical ball of diameter 21 cm is melted and recasted into cubes , each of side 1 cm . find the number of cubes thus formed .

 a spherical ball of diameter 21 cm is melted and recasted into cubes , each of side 1 cm . find the number of cubes thus formed .

since the diameter of  sperical ball is 21 cm , therefore radius=21/2 or 10.5

volume of a ball is = 4/3 * pi * 10.5 * 10.5 *10.5

                                 = 4/3 * pi * 1157.625

                                 = 1543.5 * pi

                                 = 4851  

now let total no of cube formed after melting that ball = X

therefore volume of total cube = volume of sperical ball

therefore ,

1 * 1* 1 * X = 4851

therefore X = 4851

thats the required answer 

thumbs up plzzzzzzz