SOLUTION: I am having trouble making the relationships of pii or 3.14..... for instance i know that piiR^2 (pie x radius squared) is how you find the area of a circle I know also you can u

Question 415474: I am having trouble making the relationships of pii or 3.14..... for instance i know that piiR^2 (pie x radius squared) is how you find the area of a circle
I know also you can use pii x D^2 divided by 4 because r^2 = (D/2)^2 = (d^2)/4
recently i was given the formula for volume of a pipe .785 x diameter x length where .785 is pi/4 could you please explain how you simplify the formula to get .785 x diameter x length for volume of a pipe i understand .785 is 1/4 pii but i dont understand how you get from piiR^2 x length to .785 X dia. x length for the volume and ive worked both ways the only one close is .785 formula
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
recently i was given the formula for volume of a pipe .785 x diameter x length where .785 is pi/4 could you please explain how you simplify the formula to get .785 x diameter x length for volume of a pipe i understand .785 is 1/4 pii but i dont understand how you get from piiR^2 x length to .785 X dia. x length for the volume and ive worked both ways the only one close is .785 formula
-------
Volume = Area of a cross section *length
---
But Surface = Circumference * length
S = pi*D*L
------
0.785*diameter*length looks like a surface formula to me.
-----
Cheers,
Stan H.
========
RELATED QUESTIONS
how would I solve x/2 + x/3= 3/4 I know the least common denominator is 12 but I am... (answered by ewatrrr,mananth)

Having a bit of trouble with this one. The fact that the n is an exponent is making me... (answered by stanbon)

We have to graph y=-5+4 sin 1/3(x+pie/2) I know that 4 is the y axis for the graph and... (answered by ewatrrr)

Graph the system below and write its solution. {4x+2y=6 {y=-2x+3 *It's either no... (answered by Fombitz)

I am having some trouble understanding slopes. I know that M stands for slope, and that... (answered by Alan3354,jojo14344)

How do I factor a radicand to the perfect fourth power? I have the problem.... (answered by ankor@dixie-net.com)

I am having trouble remembering how to start complex fractions. I know to multiply by the (answered by solver91311,stanbon)

I am having trouble with this problem... maybe someone can of any assistance! Solve: (answered by rmromero)