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The remaining figure is the are of polygons that bounded by three dimensional figure .
NO. This is the way to get the volume of a prism, not the surface area of any three-dimensional figure. To find the surface area of a three-dimensional figure, you must find the area of each of its faces and then add the side-areas together.
Area of a square: A=s*s A=s2
find the square root
SA = 2lw+2lh+2wh