Question

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

Answer 1

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

Answer 2

Number of cubes so formed is 4851.