No.
Platonic solids, as their name suggests, are 3-dimensional objects. A triangle is 2-dimensional.
The polygons are the equilateral triangle, the square, and the regular pentagon. The faces of these platonic solids are made from the following polygons: tetrahedron - 4 triangles cube - 6 squares octahedron - 8 triangles dodecahedron - 12 pentagons icosahedron - 20 triangles
There (not their) are 5 platonic solids.
The regular tetrahedron - one of the 5 platonic solids.
The platonic solids are: a tetrahedron, a cube, an octahedron, dodecahedron and icosahedron. A pyramid has a base with triangles attached to it with a common vertex. The platonic solid that is a pyramid is a tetrahedron (a triangular based pyramid).
A four faced figure is a tetrahedron. If they are all congruent triangles, they are all equilateral triangles and it is a regular tetrahedron - one of the 5 Platonic Solids.
hexahedron, cube
There are different numbers on the different platonic solids.
The book called Platonic Solids: The experience
We don't know for certain who discovered the platonic solids first. However, Pythagoras is credited by some sources as discovering the platonic solids first. Other sources credit Theaetetus as being the first to describe all five platonic solids and proving that these are the *only* platonic solids.
Dodecahedron. The 5 "Platonic Solids" are: Cube/ 6 square sides Tetrahedron/ 4 triangles Rhomboid/ 8 triangles Dodecahedron/ 12 pentagons Icosahedron/ 20 triangles
Why are there a limited number of platonic solids?Read more: Why_are_there_a_limited_number_of_platonic_solids
There are 5 platonic solids. They are: Tetrahedron, Octahedron, Icosahedron, Cube, and Dodecahedron