My image of a chemistry "flask" is a truncated cone with larger base on the bottom. But since this problem only gives one diameter, all you can do is assume a cylinder. The volume of a cylinder, of radius r and height h, is \(\displaystyle \pi hr^2\), the area of a base times the height. To find the surface area note that the top and bottom area circles of radius r (area \(\displaystyle \pi r^2\)) (but do you want to count both top and bottom? The flask is open at the top isn't it?). To find the area of the sides, notice that you can, after taking off the top and bottom, "cut" it from top to bottom and flatten it down to a rectangle. The length of one side will be h, the height, and the length the other will be the circumference of the top and bottom circles.
