Q. 94.4( 232 Votes )

Twenty seven soli

Answer :

(i) Volume of new sphere having radius r’ = πr’3

Volume of 27 spheres having radius r = 27 ×  πr3


According to the question,


πr’3 = 27 ×  πr3


= r’3 = 27r3


= r’3 = (3r)3


r’ = 3r


(ii) Ratio of surface area =


=


= = 1: 9

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