10 square meter is the area of 10 square meter. We know that the width of a room is 4 meters, so the depth of this shop is 10 square meter divided by 4 meters is 2.5 meters. It is equivalent to a rectangular area 4 meters long and 2.5 meters wide. You need to know how old you are in this middle number. At the same time, this store is small, only suitable for buying small commodities, or doing gold shops and the like.