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January 30, 2015

January 30, 2015

Posted by **mathematical problem** on Sunday, August 21, 2011 at 4:35am.

- math -
**Reiny**, Sunday, August 21, 2011 at 9:44amarea of two circles varies directly as the square of their radii or the square of their perimeters.

so ratio of areas = (1.25)^2 / 1 = 1.5625

it will be 156.25% of the old one.

so the area increases by 56.25%

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