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A triangular pyramid is a tetrahedron, or a solid three-dimensional figure made up of four triangular faces.
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.
A triangular prism. Triangular prisms are polyhedrons made of a triangular base, a translated copy, and 3 faces that join corresponding sides. The volume of the prism is the product of the area of the base and the distance between the two bases.
More correctly it is a 'Tetrahedron'. A Tetrahedron is a solid object with '4' (four) triangular faces. The Pyramids of Egypt are NOT tetrahedrons, because they have five(5) faces. made up of 4 triangular faces ( which you see) , and a SQUARE BAse (5th face) which they are built on.
It's a polyhedron. A polyhedron (plural: polyhedra) is a three - dimensional figure made up of sides called faces, each face being a polygon.