Q. 83.7( 6 Votes )

Two cubes have their volumes in the ratio 1 : 27. The ratio of their surface areas is
A. 1 : 3

B. 1 : 9

C. 1 : 27

D. None of these

Answer :

Given that,

Volumes are in the ration 1: 27


Therefore,


= =


a =


a =


Or b = 3a


Or


We have to find out ratio of their surface areas:


=


=


=


=


Therefore, the surface areas are in the ratio 1: 9


Hence, option B is correct

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