A prism doesn't have an area; since a prism is a 3-dimensional (i.e. solid) object it has a volume. Perhaps you meant surface area. In mathematics a prism has a rather general definition. The two end faces are polygons ( not necessarily triangles ), lying in faces parallel to each other but not necessarily exactly opposite each other, and the side faces are not necessarily rectangles, but more generally parallograms. To find the total surface area you will need to find the area of each face, then sum them. In case of difficulty, submit a new question giving details of the prism.
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The suface are of a rectangular prism is the area of each face added together for a total.
Whatever the net, the answer is the same area as that of the net.
you would have to add all the different areas of each side together to get the surface area. the formula though, would be side area times three, plus the base
Formula: S = 2B + L
The formula for the volume of a parallelogram prism is V = Bh, where B is the base area of the parallelogram and h is the height of the prism. The formula for the surface area of a parallelogram prism is SA = 2B + Ph, where P is the perimeter of the base parallelogram. The base area of a parallelogram can be calculated as A = b * h, where b is the base length and h is the height of the parallelogram.