Tetrahedron

A polyhedron with four triangular faces, four vertices, and six edges. It is the simplest three-dimensional polyhedron.

Triangle: A polygon with three sides and three angles. Each face of a tetrahedron is a triangle.
Regular tetrahedron: A tetrahedron whose six edges have equal lengths. Equal edges make all four faces congruent equilateral triangles.
Tetrahedralization: A partition of a three-dimensional region into tetrahedra. Tetrahedral meshes divide complex volumes into computable pieces.
Triangular pyramid: A pyramid with a triangular base and three triangular sides. It is another name for a tetrahedron, unlike pyramids with larger bases.
Polyhedron: A three-dimensional solid bounded by flat polygonal faces. A tetrahedron is the polyhedron with the fewest possible faces.
Tetrahedral angle: The angle between two faces meeting along an edge of a regular tetrahedron. Its approximately 70.53° face angle helps determine how regular tetrahedra pack.
Finite element method: A numerical method that approximates solutions to differential equations over subdivided domains. Tetrahedral elements mesh irregular three-dimensional shapes.
Triangular bipyramid: A solid formed by joining two triangular pyramids base to base. It has six triangular faces, compared with a tetrahedron’s four.
Vertex (geometry): A point where two or more lines, edges, or curves meet. Four vertices are the tetrahedron’s corners.
Tetrahedron volume: The volume enclosed by a tetrahedron, determined by its vertices or dimensions. For a regular tetrahedron of edge length a, the volume is a³/(6√2).

Linked from 10 pages