The ratio of the radius of two circles is 3:4 .Find the ratio of their circumferences.

a) 3:4                         b) 2:3                                    c)  3:6                         d) 3:2

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dineshAptitude
The ratio of the radius of two circles is 3:4 .Find the ratio of their circumferences. a) 3:4                         b) 2:3                                    c)...