The ratio of the area of two circle is 100:49. then the ratio of their radii would be

The areas of two circles are in the ratio 9 : 4. The ratio of their circumferences is a 3 : 2 b 4 : 9 c 2 : 3 d 81 : 16

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Two circles have areas in the ratio 49: 81 . What is the ratio of their circumferences?

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