Right and oblique tetrahedronsĪ right tetrahedron is one in which the apex is directly above the center of the base. The two triangles, shaded in blue, formed by cross sections parallel to the base of the tetrahedron above, are similar (same shape but not the same size) to the tetrahedron's triangular base. It is the polyhedron that can be formed with the fewest number of faces.Īny cross section that is parallel to the base of a tetrahedron forms a triangle that is similar to its base. A tetrahedron has 4 faces, 6 edges, and 4 vertices. An edge is a line segment formed by the intersection of two adjacent faces. ![]() We usually think of the apex as the "top" of the tetrahedron. ![]() The lateral faces share a common vertex called the apex. Properties of a tetrahedronĪ tetrahedron is a pyramid with one triangular base and three triangular sides, called lateral faces. Note that this is not the only possible tetrahedron net. A regular tetrahedron net is shown below:Įach of the outer triangles folds inwards to form the tetrahedron.
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