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What shapes are the faces on a triangular prism? A triangular prism consists of 3 rectangles and 2 triangles (one on each end). For comparison: a rectangular pyramid (like the Great Pyramids) have 4 triangles and 1 rectanglâ¦e (usually a square). A triangular pyramid has 4 triangles (imagine a normal pyramid, but with only three sides and the bottom is a triangle as well). 6 people found this useful.
To find the surface of the triangular prism, find the area of each of its pieces and then add them together. The surface area of triangular prism is the area of rectangles one, two, and three, and the area of triangles one and two.