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osman123 | 13:58 Sat 10th Jan 2009 | Quizzes & Puzzles
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how do you fine the radious with only knowing the cicumferance ? e.g if the cicumferance was 85 cm how would i do it ?
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work the formula backwards-
C = 2 x pi x r
so c divided by 2pi = radius
85 divided by 2 x 3.142 = 13.5 cm
The circumference of a circle C is given by the formula

C = 2 x Pi x r
so r = C/2 x pi
In your case r = 85/ 2 x pi

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