Tetrahedra
- Bang's Theorem
- Bialtitude
- Bimedian
- Cesàro's Theorem
- Commandino's Theorem
- Cube Tetrahedron Picking
- de Gua's Theorem
- Gergonne's Theorem
- Heronian Tetrahedron
- Isoclinal Line
- Isoclinal Plane
- Isosceles Tetrahedron
- Mannheim's Theorem
- Medial Parallelogram
- Median
- Merkaba
- Möbius Tetrahedra
- Monge Point
- Monge's Tetrahedron Theorem
- Perfect Pyramid
- Perfect Tetrahedron
- Quadriplanar Coordinates
- Regular Tetrahedron
- Reuleaux Tetrahedron
- Schläfli Function
- Sphere Tetrahedron Picking
- Steiner's Theorem
- Tangential Tetrahedron
- Tetrahedral Ring
- Tetrahedron
- Tetrahedron 2-Compound
- Tetrahedron 3-Compound
- Tetrahedron 4-Compound
- Tetrahedron 5-Compound
- Tetrahedron 6-Compound
- Tetrahedron 10-Compound
- Tetrahedron Circumscribing
- Tetrahedron Median
- Tetrix
- Trirectangular Tetrahedron
- Tritetrahedron