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 rectangl…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.