you calculate the area of one side, then multiply it by three.
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No. Relative to its volume, the greater the number of sides, the smaller the volume. In the limit, a cylinder (circular prism, with an infinite number of "sides") will have the least surface area.
47.88 cm2
Assume that a = apothem length of the triangular prism, b = base length of the triangular prism, and h = height of the triangular prism. The formulas to find the surface area is SA = ab + 3bh.
Surface area is squared; volume is cubed.
2*area of triangular base + perimeter of triangle*length of prism.