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#1




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




Re: how to find cubic feet of a cylinder?
Quote:
Volume of cylinder is V = (pi/4)*d*d*h so (3.14159/4)*(1/6)*(1/6)* 9 = 0.1963 ft³ 
#3




Re: how to find cubic feet of a cylinder?
Is that 3.14 divided by 4?

#4




Re: how to find cubic feet of a cylinder?
Quote:

#5




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




Re: how to find cubic feet of a cylinder?
Quote:
The divide by 4 is equivalent to getting radius (squared) from diameter. Same thing. 
#7




Re: how to find cubic feet of a cylinder?
May I ask what answer you may have gotten? I am correct....lol?

#8




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




Re: how to find cubic feet of a cylinder?
thanks for your help!

#10




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 Thank you for your help! 
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