1. The problem statement, all variables and given/known data The following shows a cross section through a tank with a rectangular sloping gate that is 10 m long and 4 m wide (width is measured into the page). The gate is hinged along its top edge and held closed by a force at its bottom edge at A that acts perpendicular to Gate AB. Friction in the hinge and the weight of the gate can be neglected. What is the pressure at A? 2. Relevant equations ??? 3. The attempt at a solution So I had the flu for this and don't quite know where to begin. I know you need to solve for pressure, but the way you do that is very confusing. I know it also involved centroids (I think at least) so I can apply what I'm learning about that (here) once I know what equations and theories to use for water pressure.