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December 20, 2014

December 20, 2014

Posted by **mansi** on Thursday, August 23, 2012 at 10:47am.

find the ratio of their circumferences and the ratio of their areas

- math -
**Reiny**, Thursday, August 23, 2012 at 12:30pmCircumference is a linear measurement, so

the ratio is still 2:3

but...

areas of circles are proportional to the square of their radii.

so 2^2 : 3^2 = 4 : 9

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