Four triangular faces.
3
A tetrahedron or triangular pyramid.
A triangular pyramid is a tetrahedron, or a solid three-dimensional figure made up of four triangular faces.
A tetrahedron is a solid figure with 6 edges. There's no such thing as solid edges. A tetrahedron is a triangular pyramid, with 4 vertices, 6 edges and 4 triangular faces. In a regular tetrahedron (the first Platonic solid) all triangles are equilateral.
A triangular pyramid has 4 faces and has 6 edges
There is no solid figure with only four edges. The smallest solid figure is the tetrahedron, made up of four triangular faces, but it has six edges.
Tetrahedron.
a tetrahedron, an icosahedron or a pyramid
It is a tetrahedron which is a triangular based pyramid having 4 faces, 6 edges and 4 vertices
tetrahedron
A tetrahedron (triangular pyramid).
It is a TETRAHEDRON . Incorrectly named a triagular pyramid.
A triangular based pyramid (tetrahedron) has 4 triangular faces, 6 edges and 4 vertices.