The problem states: The trough in the figure is to be made to the dimensions shown. Only the angle theta can be varied. What value of theta will maximize the troughs volume? http://img81.imageshack.us/img81/5963/24ni3.jpg [Broken] (There is an image of the problem) I know the height in terms of theta is h/1 = h So the cross sectional area is 1/2(h)(1)sin(theta) = 1/2 cos(theta)sin(theta) This is as far as I have gotten. I don't even know if this is right. Please help!