Number of faces = 4
Any one of them could be a base, so number of bases also = 4
Therefore, sum = 8
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It is the sum of the areas of its four faces.
one base nine faces
Find the surface area of each of the four triangular faces (they need not be the same) and sum the individual areas.
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.
A prism is a polyhedron with two parallel bases bounded by congruent polygons and with lateral faces bounded by parallelograms that connect the corresponding sides of the bases. The height of a prism is any perpendicular line drawn from a point on one base to the other base. If the the bases' shape of a prism is a triangle, we call it a triangular prism (it has 3 faces). The surface area is the sum of the bases' area and the faces' area (lateral area).