tetrahedron
A pyramid
A triangular pyramid.
a triangular pyramid.
A regular tetrahedron (triangular pyramid).
a triangular pyramid
tetrahedron
There are an infinite no of shapes that have exactly 4 triangular faces. The two commonest are a tetrahedron and an Egyptian pyramid. If the question is re-phrased to "What shape has exactly four faces, (all of which are triangular), then the only answer is a tetrahedron. An Egyptian pyramid has five faces - a square base and four triangular sides. It is regular (the apex is vertically above the center of the base) and the sides are isosceles.
A pyramid
Triangular prism * * * * * No. It is a triangular pyramid or a tetrahedron. A triangular prism has 6 vertices and 5 faces.
A triangular pyramid.
triangular pyramid
There is no 3-d shape with 4 and 1 = 5 triangular faces.
Tetrahedron
Yes.
A triangular pyramid.
triangular pyramid