it's a pyramid with 5 sides.
Your thinking of the six sided die.
It depends on what you mean by a 3-d pentagon. To most people, a 3-d pentagon is a dodecahedron - a 3d shape with 12 pentagonal faces. In that case, each of the faces, by definition, must be a pentagon! If you mean a pentahedron - a 3d shape with 5 plane faces, it could be a triangular prism or a quadrilateral based pyramid. In the first cae the bases are triangles, in the second, a quadrilateral.
triangular prism
a triangular prism
triangle... because pyramids are triangular therefore triangular pyramids have triangle faces
A pentagonal pyramid
A shape with 5 sides is called a pentagon.
A square pyramid.
A shape that has some triangular faces is a pyramid.
A triangular prism
Your thinking of the six sided die.
Such at figure - as described - could not be made as a solid geometric shape.
A pyramid with an irregular pentagon base.
All except the base are always triangles; the shape of the base gives the name to the pyramid; eg a pentagonal pyramid has a pentagon as the base and five triangular faces; a triangular pyramid has three triangular faces and also has a triangle for the base.
Triangular Pyramid......... The faces are Triangular....
A 3D shape with one base and three faces can only have triangular faces.
It depends on what you mean by a 3-d pentagon. To most people, a 3-d pentagon is a dodecahedron - a 3d shape with 12 pentagonal faces. In that case, each of the faces, by definition, must be a pentagon! If you mean a pentahedron - a 3d shape with 5 plane faces, it could be a triangular prism or a quadrilateral based pyramid. In the first cae the bases are triangles, in the second, a quadrilateral.