SOLUTION: Solve for the indicated variable: A = 2pi r^2 + 2 pi r h for positive r or A = 2 Πr^2 + 2Πrh Thank you! You are great!

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Solve for the indicated variable: A = 2pi r^2 + 2 pi r h for positive r or A = 2 Πr^2 + 2Πrh Thank you! You are great!      Log On


   

Question 206335: Solve for the indicated variable:
A = 2pi r^2 + 2 pi r h for positive r
or A = 2 Πr^2 + 2Πrh
Thank you! You are great!
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Answer 155372 by Alan3354(4174) on 2009-08-07 08:17:42 (Show Source):
write formula in terms of its radius: S=2pi*r*h+2pi*r squared
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S=2pi*r*h+2pi*r^2
r^2 + rh = S/2pi
r^2 + rh - S/2pi = 0
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r+=+%28-h+%2B+sqrt%28h%5E2+%2B+2S%2Fpi%29%29%2F2