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Changing Areas, Changing Volumes

Stage: 4 Challenge Level: Challenge Level:1
Try working on Changing Areas, Changing Perimeters first, as it is a two-dimensional version of this three-dimensional problem.
 
If I know two rectangles have the same area, how can I decide, just by looking at their dimensions, which has the greater perimeter?
If I know two cuboids have the same volume, how can I decide, just by looking at their dimensions, which has the greater surface area?