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

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Given: Ratio of diameter = d1 : d2 = 3 : 4

Ratio of their circumferences C1 : C2 = πd1 : πd1

= 22/7 × 3: 22/7 : 4 = 3 : 4

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