Find the area of each face and add them all up.
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The Surface area of a triangle = 0.5*base*height The volume of a prism = area of its cross-section*length
Find the area of each face separately and then add them together for the total surface area.
2*area of triangular faces + perimeter of triangle*length of prism (not prisim).
The surface area of a cylinder prism has round shape and the surface of a rectangular prism has a square shape.
The surface area of a prism is the two bases and all the sides A = 2 *area of base + Perimeter of base * Height of prism.