A triangle is not a polyhedron. A triangle is a two-dimensional figure, and a polyhedron is a three-dimensional solid. An example of a triangular-shaped polyhedron is a pyramid.
The answer is a polyhedron
square and hexagon
it is a triangle prism
Yes
Tetrahedron
It is a face of the polyhedron
Each surface of a polyhedron is called a face.
pyramid
Octahedron.
Tetrahedron
Its surface, would you believe!