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(Doug Miller) writes:
In article , The Real Tom Tom @ www.WorkAtHomePlans.com wrote:
On Tue, 15 Mar 2005 13:05:04 -0500, Harry Everhart
wrote:

How much water is in a 100 foot by 1/2 inch copper tube?

(ID/2) x 3.1416 x (pipe length)

Just guessing.....

Not a good guess. The formula is A = pi * radius SQUARED,
not pi * radius / 2.

Not to nitpick, but the OP had suggested pi*radius (i.e., ID/2), not
pi*radius/2.

So in terms of ID,
the formula is: pi*(ID/2)*(ID/2) where pi=3.14159....