pyramid
A pyramid fits the given description
The 7-letter word for a 3D shape with triangular faces is "pyramid." A pyramid is a polyhedron with a polygonal base and triangular faces that meet at a common vertex called the apex. Pyramids are classified based on the shape of their base, such as square pyramids, triangular pyramids, pentagonal pyramids, etc.
The given description fits that of a triangular based pyramid which has 4 faces, 6 edges and 4 vertices
A vertex can be the corner of a polyhedron in which case at least three edges meet at a vertex.
An endpoint where two edges intersect on a polyhedron is called a vertex.
A pyramid fits the given description
There are an infinite number of such polyhedra. Starting with a tetrahedron (triangular base), the next up is the quadrilateral pyramid (quadrilateral base), then the pentagonal pyramid, the hexagonal pyramid and so on.
polyhedron
The 7-letter word for a 3D shape with triangular faces is "pyramid." A pyramid is a polyhedron with a polygonal base and triangular faces that meet at a common vertex called the apex. Pyramids are classified based on the shape of their base, such as square pyramids, triangular pyramids, pentagonal pyramids, etc.
No such thing A tetrahedron is a polyhedron composed of four triangular faces, three of which meet at each vertex. Similar to a pyramid but with a triangular base.
A pyramid has a polygonal base with all other sides being triangles. As the Egyptians famously demonstrated, a common pyramid has a square base with four triangles meeting at a vertex, but any polygon - regular or irregular - can be used as the base of such a polyhedron.
pyramid
There are an infinite number of possible solutions. A tetrahedron and icosahedron are regular shapes. Then there is the triangular prism. A cuboid with one vertex cut off, a cube with 2 vertices cut off, 3 vertices etc. In fact, cutting off the vertex of any polyhedron in which three sides (faces) meet at the vertex will give a new triangular face.
Pyramid
The given description fits that of a triangular based pyramid which has 4 faces, 6 edges and 4 vertices
A pyramid seems to fit the description.
A polyhedron of which one face is a square, and the other faces are triangles with a common vertex.