The figures below do not strictly have a "base" but they are composed entirely of triangles
A square pyramid.
Triangular Pyramid......... The faces are Triangular....
It is a triangular prism
triangular prism
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.
Triangular Pyrimid
It is a pyramid
That would be a triangular pyramid.
A triangular prism can have a square or triangular base, but faces are normally triangles. (I think)
It depends on the shape of the base, but yes it has at least 3 triangular faces!(yes)
A tetrahedron.
A pyramid perhaps
Triangular Pyramid
A pentagonal pyramid
tetrahedra (a pyramid with a triangular base)
A square pyramid.
hexagonal pyramid