what is the cross section area of the water?? 1. The problem statement, all variables and given/known data Determine an expression for the cross sectional area A of the fluid in the tank as a function of D and H. 2. Relevant equations A=pi*r2 3. The attempt at a solution i try to let the radius equal to the height but then the fluid's height goes lower, it doesn't form a circle anymore. So i have no ideas how to do this.Please help.