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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).

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Q: When was the surface area formula developed for the triagular prism?
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