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March 30, 2015

March 30, 2015

Posted by **Andrew** on Thursday, February 22, 2007 at 7:46pm.

pi [(8^2) - (7.8)^2]

8 cm is the radius of the outside of the outer ring, and 7.8 is the radius of the inside of that ring.

I have neglected the bark of the tree when considering the radius of the outer ring to equal (tree diameter)/2

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