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#1
03-20-2008, 01:44 PM
 chuuxx Guest Posts: n/a
how to find cubic feet of a cylinder?

I need to know how many cubic feet are in a hole that is 2" in Diameter and 9' deep.

Can you help?
#2
03-20-2008, 02:22 PM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,536 Rep Power: 19
Re: how to find cubic feet of a cylinder?

Quote:
 Originally Posted by chuuxx I need to know how many cubic feet are in a hole that is 2" in Diameter and 9' deep. Can you help?
Well, you need the diameter in feet 2"/12"/ft = 1/6 ft or 0.1667 ft.

Volume of cylinder is
V = (pi/4)*d*d*h so (3.14159/4)*(1/6)*(1/6)* 9 = 0.1963 ft³
#3
03-20-2008, 02:27 PM
 chuuxx Guest Posts: n/a
Re: how to find cubic feet of a cylinder?

Is that 3.14 divided by 4?
#4
03-20-2008, 02:39 PM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,536 Rep Power: 19
Re: how to find cubic feet of a cylinder?

Quote:
 Originally Posted by chuuxx Is that 3.14 divided by 4?
Yes, althouh "pi" has an infinite number of digits. Some use 3.14, some use 3.14159; usually the rest of the numbers aren't exact enough to use too many digits. I actually used the "pi" key on my calculator.
#5
03-20-2008, 03:05 PM
 chuuxx Guest Posts: n/a
Re: how to find cubic feet of a cylinder?

I come up with .1964280 cubic feet......that don't seem right.

To find the volume of a cylinder; I thought it was 3.14 x radius squared x 9
3.14 x .006947 x 9
is that not correct?
#6
03-20-2008, 03:23 PM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,536 Rep Power: 19
Re: how to find cubic feet of a cylinder?

Quote:
 Originally Posted by chuuxx I come up with .1964280 cubic feet......that don't seem right. To find the volume of a cylinder; I thought it was 3.14 x radius squared x 9 3.14 x .006947 x 9 is that not correct?
You can use either (pi)*r²*h or (pi/4)*d²*h
The divide by 4 is equivalent to getting radius (squared) from diameter. Same thing.
#7
03-20-2008, 03:47 PM
 chuuxx Guest Posts: n/a
Re: how to find cubic feet of a cylinder?

May I ask what answer you may have gotten? I am correct....lol?
#8
03-20-2008, 03:52 PM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,536 Rep Power: 19
Re: how to find cubic feet of a cylinder?

I gave the answer in post #2 (at end). We agree within rounding of pi and the fractional foot radius or diameter.
#9
03-20-2008, 04:13 PM
 chuuxx Guest Posts: n/a
Re: how to find cubic feet of a cylinder?

#10
03-25-2010, 03:31 AM
 ghco Guest Posts: n/a
Re: how to find cubic feet of a cylinder?

I have to figure how many bags of grout to fill a hole.
The hole is 75' deep and 4" in diameter.
The bags are 1.29 cubic feet each

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