# Math help for a DTY project

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• 06-14-2011, 21:36
Math help for a DIY project
I need to figure out a length of a cylinder
I know the volume (800ci) and the radius, (1.5")
I need to know the height/length
If:
V=3.14 x r2 x h
800ci = 3.14 x 2.25 x h
800 = 7.065 x h
or 800/7.065 = h
h = 113.23"

? ? ?

Thanks eh
• 06-14-2011, 21:48
Eliteoomph
37.72562 ft
that sound right?
• 06-14-2011, 21:49
Quote:

I need to figure out a length of a cylinder
I know the volume (800ci) and the radius, (1.5")
I need to know the height/length
If:
V=3.14 x r2 x h
800ci = 3.14 x 2.25 x h
800 = 7.065 x h
or 800/7.065 = h
h = 113.23"

? ? ?

Thanks eh

Checks out to me. if you use PI to a few more digits you get h=113.17" :cool: But maybe Pi = 3.14 in Canada....
• 06-14-2011, 21:52
Eliteoomph
no no 9.41 ft... about 113 inches long
• 06-14-2011, 21:53
Eliteoomph
yeah that's right... i messed up in my first one ;o) but i quickly saw my mistake
• 06-15-2011, 06:38
Ramblinrev
Quote:

I need to figure out a length of a cylinder
I know the volume (800ci) and the radius, (1.5")
I need to know the height/length
If:
V=3.14 x r2 x h
800ci = 3.14 x 2.25 x h
800 = 7.065 x h
or 800/7.065 = h
h = 113.23"

? ? ?

Thanks eh

I'm no math scholar

Edited to let that statement stand by itself as ontological proof of it's truth.
• 06-15-2011, 06:52
DTY?

lengthen your message to at least 10 characters.
• 06-15-2011, 07:14
XexorZ
113.177 Inches

Pi * r ^ 2 * h = v

Pi * 1.5 ^2 * h = 800

h = v / ( Pi * r ^2 )

h = 800 / (Pi * 1.5 ^2)

h = 800 / 7.06858

h = 113.177

( really roughly: )
h = ~ 113 3/16
• 06-15-2011, 07:21
Dutch
I think it is a little more than 113, but I didn't use math. It came to me in a premonition.
.
• 06-15-2011, 07:32
oldgringo
What is this "math" you speak of??????:p
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