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Reply by crank49

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Posted on Building a Dust Collector Cabinet

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crank49

3434 posts in 1625 days


#1 posted 03-26-2012 04:14 AM

Area of a circle (pipe) is Pi X®^2.

So radius of a 4” pipe is 2” so: area = 3.14159 X 2 squared = 12.566 square inches

Radius of 6” pipe is 3” so: area = 3.14159 X 3 squared = 28.27 square inches

-- Michael :-{| “If you tell a big enough lie and tell it frequently enough, it will be believed.” ― A H


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