2006-07-01 01:45:59 · 6 answers · asked by jmiller1977 1 in Cars & Transportation ➔ Other - Cars & Transportation
Use "PI". By dividing the circumference, 8-inches as you say, by 3.14, you will get the diameter of the piping.
pi (you know it is pronounced as "pie") - 3.14
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-TORCH
2006-07-01 01:52:10 · answer #1 · answered by TORCH 3 · 0⤊ 0⤋
The formula for circumference is C=2(pi)r. The circumference of your pipe is 8 inches derived from direct measurement. If we transpose the formula for circumference we can derive the radius of the pipe. R=C/2(pi)
pi = 3.14 (rounding to two digits). 2(pi) = 6.28
R = C/2(pi) = 8/6.28 = 1.2739
Diameter = 2 times the radius so the Diameter is 2x1.2739 or 2.5477 inches.
While this would tell me I have a pipe that is 2.5477 inches in diameter, you are specifically asking for the diameter across the inside which would have to take wall thickness into account. The only pipe in a car that comes to 2.5 inches in diameter that I know of is the exhaust pipe. I would think a quick phone call to a muffler shop could tell you the average thickness of the materials they use but I think we can safely assume 1/8" thick or 0.125".
Subtracting two wall thicknesses (across a diameter) from 2.5477 inches (calculated diameter) we would then have a pretty darn close approximation of the inside diameter of this pipe.
2.5477 - 0.125 -0.125 = 2.2977. I would just round to 2.3 but with only 0.0477 remaining to get to 2.25" inches and manufacturers typically producing things to a standard dimension, I would opt to say the inside diameter of your pipe is 2-1/4 inches.
I hope this helps!
2006-07-01 02:08:20 · answer #2 · answered by Les 4 · 0⤊ 0⤋
If you measured the circumference of the pipe, on the outside, you will not get an accurate diameter of the inside of the pipe, using the formula. You have to know the thickness of the pipe and factor that in.
If you can measure the circumference, why then can you not just measure the width of the opening? Presumably you used a tape measure.
2006-07-01 01:56:37 · answer #3 · answered by regerugged 7 · 0⤊ 0⤋
If it contains liquid measure across the inside. If it structural,(load bearing) measure across the outside and measure the wall thickness.
2006-07-01 01:56:12 · answer #4 · answered by Anonymous · 0⤊ 0⤋
~Yes, there is. Reverse the formula for determining the perimeter, then apply the result to the formula for determining the radius and double it. And pay attention in class.
2006-07-01 01:51:20 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Just cut the circumference *which would be 4* in half or perhaps measure it.
2006-07-01 01:53:49 · answer #6 · answered by Anonymous · 0⤊ 0⤋