<P> In geometry , a tetrahedron ( plural : tetrahedra or tetrahedrons ) , also known as a triangular pyramid , is a polyhedron composed of four triangular faces , six straight edges , and four vertex corners . The tetrahedron is the simplest of all the ordinary convex polyhedra and the only one that has fewer than 5 faces . </P>
<P> In geometry , a tetrahedron ( plural : tetrahedra or tetrahedrons ) , also known as a triangular pyramid , is a polyhedron composed of four triangular faces , six straight edges , and four vertex corners . The tetrahedron is the simplest of all the ordinary convex polyhedra and the only one that has fewer than 5 faces . </P>
what is the shape of each face of a tetrahedron
what is the shape of each face of a tetrahedron
triangular
triangular