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March 6, 2015

March 6, 2015

Posted by **John** on Thursday, February 28, 2013 at 12:00am.

- Geometry -
**Steve**, Thursday, February 28, 2013 at 12:07am4/3 pi r^3 = 4 pi r^2

1/3 r = 1

r = 2

v = a = 36pi, so N = 36

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