How many faces does a tetrahedron have?

A tetrahedron is defined as a polyhedron with four triangular faces. Each face of a tetrahedron is a triangle, and they come together at four vertices. This geometric shape is one of the simplest forms of a three-dimensional object and is often referred to as a triangular pyramid.

To visualize this, imagine a pyramid where the base is a triangle; the apex (top point) connects to each vertex of the triangular base, forming the needed triangular faces. Since there are four faces in total—one for each side of the base triangle and one formed by the apex and the base—this solid is characterized by having exactly four faces.

This is a fundamental property of a tetrahedron, making it vital for understanding its geometry and distinguishing it from other polyhedra with a different number of faces.