Math help please

I have a problem I need to invert(I think).Maybe convert is the proper way to say it.
First off,this is what I'm working with so far.

d=Sqrt(((48*t*l)/Pi)+c^)

If:
t(thickness)=.00185
l(length)=20,000'
c(core o.d.)4''
Then:
d(diameter)should be 24.11

Given that info I would like to find the l(length)in stead of d(diameter)from the info given above.

I assume the missing exponent of c^ is 2. Try

l = (d^2 - c^2)*cPI/(48*t)

agraham said:

I assume the missing exponent of c^ is 2.

Click to expand...

Your right about the exponent.

The formula works perfectly.
THANKS