A spherical solid ball of diameter 21 cm is melted and recast into cubes each of side 1 cm find the number of cubes thus formed
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d of sphere = 21 cm
TSA of sphere= 4πr²
= 4*22/7* 21/2*21/2
=1386 cm²
TSA of cube = 6a²
= 6 * 1*1
= 6 cm²
no of cubes formed = TSA of spherical ball/ TSA of 1 cube
= 1386/6
=231 cubes
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1
Number of cubes so formed is 4851.
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