A triangular pyramid.
If the triangles are congruent then it is a triangular-based prism.
A 3-dimensional shape. 5 plane faces: 3 rectangular, 2 triangular. Triangular faces parallel to one another. 6 vertices 9 edges
It is a triangular prism
No, a dodecahedron is a 3-dimensional shape. Some of the 6.4 million topologically distinct dodecahedra have only triangulat faces, there are many more in which some faces, but not all, are triangular.
A triangular pyramid. This is one where all the faces are triangles - a three-sided base, from which three triangular faces rise to a single point - the apex.
A triangular-based pyramid
A triangular prism (Two triangles as the two bases)
triangular prism
a triangular prism
A triangular pyramid has 4 corners and 6 edges (and 4 faces).
Triangular Pyrimid