EntityQ14918679· pop 17· linked from 136 articlesregular tetrahedronSign in to savePlatonic solidConnectionscubeEntitypolyhedronEntityfaceEntityhandednessEntitypentachoronEntitystellated octahedronEntitytetrahedral symmetryEntitytetrahedral-octahedral honeycombEntityPlatoEntitySolar SystemEntityJohannes KeplerEntityInternational Standard Book NumberEntityDavid HilbertEntitysquareEntityPythagorean theoremEntityrectangleEntitydigital object identifierEntityorigamiEntitypyramidEntityequilateral triangleEntityCategoriesDeltahedraPlatonic solidsTetrahedra