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January 30, 2015

January 30, 2015

Posted by **Sam** on Wednesday, January 29, 2014 at 7:26pm.

- Math -
**bobpursley**, Wednesday, January 29, 2014 at 7:36pmarea path= area outer-area inner

= PI (9^2 - 7^2)= PI*(81-49) figure that out.

Now, bags of stones=1bag/5 * area

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