1. The problem statement, all variables and given/known data A 55 kg cheerleader uses an oil-filled hydraulic lift to hold four 110 kg football players at a height of 1.0m. If her piston is 16 cm in diameter, what is the diameter of the football players' piston? 2. Relevant equations F1/A1=F2/A2 A=pi*r^2 F=mg 3. The attempt at a solution (55)(9.8)/pi(0.08)^2=(440)(9.8)/pi(r^2) After I did this, I realized that I need to work the height into the equation, but I'm not sure where it would fit in.