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Triangular Prism
It is a triangular prism.
Triangular faces (and cross section).
It is a triangular prism.
It is a triangular prism
The shape described is a triangular prism.
If the triangles are congruent then it is a triangular-based prism.
triangular prism
A triangular prism (like a bar of toblerone).A triangular prism.
A triangular prism.
A triangular prism has two triangular faces, a rectangular prism does not have any.
The 3D shape you are describing is a pentagonal pyramid. It has a pentagonal base with five sides, and five vertices where the triangular faces meet. The three rectangle faces are lateral faces that connect the triangular base to the apex of the pyramid. The pentagonal pyramid is a type of pyramid with a polygonal base and triangular faces.