The bottom side and the top side are equal and have l and w as dimensions. The Surface Area of a Rectangular Prism Formula is large SurfaceAreaofaRectangularPrism2bllhhb Where b base length of the rectangular prism. The surface area of a rectangular prism if its length l height h and breadth b are given is.
Can you picture in your mind how the squares can fold up to make a cube.
Since a rectangular box or tank has opposite sides which are equal we calculate each unique sides area then add them up together and finally multiply by two to find the total surface area. Given below is an illustration of rectangular prism. In a cuboid we can represent the side a l b h a l b h. Surface Area 2lb bhlh 2 l b b h l h The unit of measurement of the area of the rectangular prism is square units.