SOLUTION: I need a formula to find r ( top radius) of a frustum given h 108cm,R(bottom radius)1.1m weight 8200Kg(density of concrete 2400Kg/m^3
I have been given V = 1/3 pi h (R^2+Rr+r^2
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Question 361937: I need a formula to find r ( top radius) of a frustum given h 108cm,R(bottom radius)1.1m weight 8200Kg(density of concrete 2400Kg/m^3
I have been given V = 1/3 pi h (R^2+Rr+r^2)
I am just so stuck !!!!!
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Convert the weight to volume using the density, .
.
.
.
Use the quadratic formula,
You'll get two answers, one negative, one positive.
Only the positive one makes sense here.
The units for the answer will be meters.
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