A garbage container is to be constructed out of 400 ft2 of material. The vessel will have a square base and an
open top. Find the width and the height of the container that maximize its capacity and give the maximum
capacity? Round your answers to 3 decimal places. 

im confused about this problem. It says is it constructed out of 400sqft of material. So does that mean i need to use the Surface area formula? The answer is asking for the length width and volume. so this is making me think that i need to use the the volume formula.. can someone help me through this one?