Math question

[outlaw38]

If i have a hole I drilled that is 7 inches in diameter and 10 foot deep, and I place a 4 inch PVC pipe in the hole to the bottom. The PVC measures 4.5 OD. How many cubic feet is left inbetween the two. I am wanting to fill the void with a liquid foam and need to know how many cubic feet it is so I can order the correct amount. That stuff is expensive. Thanks

[gumbl3]

Volume of the hole is 4618 cu/in volume of the od tube is 1909.. should be 2709 cu/in.. 1.5 cu ft give or take

[ducks-and-bucks]

Volume=pie×radius squared×hight

Pie=3.14

Figure out the volume of the 7 inch hole/cylinder..... then find the volume of the 4.5 inch cylinder...... thensubtract the 4.5 volume from the 7 volume...


I aint no math wiz though... I had a sugar mama that did my stats work in college... I made her happy in return... a thank you thank you kinda deal...

[LukeDuke]

2708 cubic inches left over is what I got...

[miket]

I got 1.567 cubic ft

[outlaw38]

1.5 cu ft is what i'm going with. Thanks

[diego111993]

.

[Bassbucker]

Uh,Uh, yeah, what everybody else said

[kikn]

I got 78.5 cubic ft.

(7x3.14)120" - (4.5x3.14)120"

2637.6"- 1695.6"

942"/12 = 78.5'

[TXAUfinder]

The answer is purple because the king said so.
Sorry couldn't resist.

[afishinman14]

I got 78.5 cubic ft.

(7x3.14)120" - (4.5x3.14)120"

2637.6"- 1695.6"

942"/12 = 78.5'

You used diameter x pi x height

Should be pi x radius x radius x height.
(Pi times radius squared)

1.5 cu ft is a correct answer. (1.5677119...)

[brrdnk]

Above my paygrade

[rubydog]

I just use the guzzenta factor. I just pour until I figure out how much guzzenta the hole.

[Jerry H]

The train will arrive 2:00 PM Eastern time

[tmurray]

The Horse's name is Friday