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A tetrahedron is a polyhedron with four sides (tetra means 4) that are triangles. So one fourth of a tetrahedron is a triangle.
A tetrahedron has 4 faces and 4 vertices.A tetrahedron has 4 faces and 4 vertices.A tetrahedron has 4 faces and 4 vertices.A tetrahedron has 4 faces and 4 vertices.
"Vertices" means corners. "Tetra" means four and "hedron" means side, so a tetrahedron is a four sided object. A tetrahedron looks like pyramid. Each side is a triangle. The bottom of a tetrahedron is a triangle, and a tetrahedron goes up to a point at the top. The three corners of the triangle at the bottom plus the point at the top gives you a total of four corners.
A tetrahedron must be plane faced and so, it is just an ordinary tetrahedron.