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November 23, 2014

November 23, 2014

Posted by **chaithu** on Thursday, November 8, 2012 at 10:18am.

- maths -
**Steve**, Thursday, November 8, 2012 at 10:30amarea of base: pi(8^2-6^2) = 28pi

outer area: 2pi*8*63 = 1008pi

inner area: 2pi*6*63 = 756pi

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