c=2 pi r

get rid of r?:confused:

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- December 5th 2006, 08:17 AMturbod15bC=2 pi r (how do i make 'r' the subject?)
c=2 pi r

get rid of r?:confused: - December 5th 2006, 08:45 AMCaptainBlack
- December 5th 2006, 08:53 AMturbod15b
ty

if pi=3.142 and c=2.84cm

how do i find 'r' ? to 2 significant numbers?

3.142*2.84=8.9? - December 5th 2006, 09:37 AMtopsquark
- December 5th 2006, 10:19 AMturbod15b
aint it 28.4/(2x3.142)=4.5 > 2 significant numbers

radius = circumference/(2*pi):confused: - December 5th 2006, 10:28 AMtopsquark
- December 5th 2006, 11:12 AMturbod15b
yeh i meant 28.4cm sorry:rolleyes: