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#1
01-09-2008, 09:21 AM
 Unregistered Guest Posts: n/a
Measurement

I have a 5.00 inch diameter tube which is 65.00 inches long.
If I multiply 5 x pie x 65= 1021.01 sq. in./144=7.09 sq. ft if I divide again
by 12= .59.........what units is this considered to be cubed ft.?
Some people think this is linear yards but I dont think you can convert
square feet into linear yards as linear yards simply implies length with any
given width?
#2
01-10-2008, 04:23 AM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 8,708 Rep Power: 17
Re: Measurement

Quote:
 Originally Posted by Unregistered I have a 5.00 inch diameter tube which is 65.00 inches long. If I multiply 5 x pie x 65= 1021.01 sq. in./144=7.09 sq. ft if I divide again by 12= .59.........what units is this considered to be cubed ft.? Some people think this is linear yards but I dont think you can convert square feet into linear yards as linear yards simply implies length with any given width?
5"*pi*65" gives the surface area of the tube (not including any cap on ends) in sq inches and your conversion to sq feet is correct.

I don't know what you are trying to do when you divide again by 12. 12 what?

If you are trying to ccompute the volume of the tube, you have to use a different formula. Volume of a cylinder is
(pi/4)*d*d*h. If you use dimensions in inches, result will be cubic inches. There are 1728 cu in. per cu ft.

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