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.
Octahedron.
Octogon
Yes it is a tetrahedron
Tetrahedron - a pyramid with a triangular base.
7 faces
The answer is a polyhedron
square and hexagon
it is a triangle prism
Yes
Tetrahedron
pyramid
There are many possible answers.
Octahedron.
Tetrahedron
It is a tetrahedron = a triangle based pyramid.
yes it is called a octahedron
if you mean common: one of the triangle, square, and pentagon vertion of pyramid, dipyramid, and gyrolongated dipyramid. a total of 9.