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A spherical ball of diameter 21cm …

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A spherical ball of diameter 21cm is melted and recast into cubes ,each of side 1cm .Find the no. of cubes so formed...Answer is4.5cm

    • Posted by Isha Saini 6 years, 11 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Gaurav Seth 6 years, 11 months ago

    Sphere: d=21cm hence r=21/2 cm.

    vol. of sphere = 4/3 x 22/7 x 21/2 x 21/2 x 21/2

                              =  77 x 3 x 21 = 1617x3 = 4851cm3

    Cube: side= 1cm

    vol. of cube = a3 = 13 = 1cm3

    No. of cubes formed from the sphere= volume of sphere / volume of cube 

                                    = 4851/1 = 4851

    Hence the number of cubes that can be formed = 4851

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