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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A triagular prism has 5 faces, 9 edges and 6 vertices
imagine a bunch of triangles stacked
It is a triagular prism
all of its edges are straight