If i am reading this correctly hot chocolate only requires one cup of milk, meaning you can make up to 7 cups of hot chocolate. Please tell me if that was a mistype.
This can vary, some shapes have different area formulas, here are some basic formulas I can give you: Circle: A = Triangle: A = Square: A = Rectangle: A = L*W
Triangle: A = 
Square: A = 
Rectangle: A = L*W