Dual Tetrahedron 11 | VIN&CO,Designing the stellated octahedron with Onshape: the two tetrahedra approach,Dual Tetrahedron - Art of Play,GOLDEN ANGLE 137.5 DEGREES 4:35 AND TETRAHEDRON 11 OCTAHEDRON 11 HEXAHEDRON 11 MINUTES - DEGREES - TIME WITH 2:74 - 274 MINUTES - 274 DEGREES - HOW MANY RED LINES - WIN,Article 46: Geometry - Platonic Solids - Part 7 - The Star Tetrahedron - Cosmic Core,