split the wedge into a triangle and a and rectangle or square. Then calculate the surface area for each shape and add them together
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It is the length of the sloped side of the wedge divided by its width.
The surface area of a rectangular prism is the sum of the length times the width of its three pairs of faces. A triangular wedge is half of that.
surface area divided by volume
The same way you calculate the surface area of any other rectangle: Multiply the length of the wall by its height.
To calculate the surface area of a shape find the area of each side, and then, add all of the areas together. The sum of the areas is the surface area.