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Triangular prisms

A triangular prism has a triangle for the base. Every cross-section parallel to the base is also a triangle.

Triangular prism, with shaded cross-section parallel to the base.

A net of a triangular prism is shown here.

Net of triangular prism.

A triangular prism has 5 faces, 6 vertices and 9 edges. To build a rectangular prism with construction materials, we would need 3 rectangles and 2 triangles that join at the edges to make a closed three-dimensional shape or 9 edge pieces and 6 corner pieces to make a frame of the prism.

A triangular prism can also be called a pentahedron because it has five faces. Penta means five.