This is kind of a stupid-sounding problem but here it is: Stadium Popcorm Problem A piece of heavy stock paper is cut into a circle with a radius of 4''. The paper is cut form one edge to the center and shaped into a cone-shaped holder. What is the maximum volume of the resulting cone? Volume of a cone: 1/3pi*r^2*h This is the exact problem my teacher gave my class and she said if you can do this without my help, it will be extra credit. Well no one in my class knows how to do it and I could really use some extra credit so if someone could help me out that would be great. I guess the title is implying that the problem is related to a snack container at a sports stadium. I know that I have to differentiate the equation for the volume of a cone but I don't know where to go from there.