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September 14, 2014

September 14, 2014

Posted by **edward** on Saturday, November 24, 2012 at 4:07am.

- maths -
**Steve**, Saturday, November 24, 2012 at 4:55amassuming it had zero area at t=0,

a = pi r^2

da/dt = 2pi r dr/dt

2 = 2pi (28/11) dr/dt

11/(28pi) = dr/dt

- maths -
**edward**, Saturday, November 24, 2012 at 7:12ami tried this way but answer not coming..... :/

ans is 0.25

- maths -
**Steve**, Saturday, November 24, 2012 at 10:39amnope. I don't buy it. I think the answer lost a factor of 2 somewhere. 11/(28pi) is 0.125

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