A rotating tetrahedron
Alternative forms
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Etymology
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From Ancient Greek τετράεδρον (tetráedron, “triangle-based pyramid”), from τετράεδρος (tetráedros), from τετράς (tetrás, “four”) + ἕδρα (hédra, “seat”). By surface analysis, tetra- + -hedron.
Pronunciation
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tetrahedron (plural tetrahedrons or tetrahedra)
- (geometry) A polyhedron with four faces; the regular tetrahedron, the faces of which are equal equilateral triangles, is one of the Platonic solids.
Derived terms
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Translations
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polyhedron
- Armenian: please add this translation if you can
- Belarusian: тэтра́эдр m (tetráedr), чатырохсце́ннік m (čatyroxscjénnik), чатырохсце́н m (čatyroxscjén)
- Bulgarian: тетраедър (bg) m (tetraedǎr)
- Catalan: tetràedre (ca) m, tetraedre (ca) m
- Chinese:
- Mandarin: 四面體／四面体 (zh) (sìmiàntǐ)
- Czech: čtyřstěn (cs) m, tetraedr (cs) m
- Danish: tetraeder n
- Dutch: viervlak (nl) n, tetraëder (nl) m
- Esperanto: kvaredro
- Finnish: tetraedri (fi), nelitahokas (fi)
- French: tétraèdre (fr) m
- German: Tetraeder (de) n, Vierflächner m
- Greek: τετράεδρο (el) n (tetráedro)
- Hebrew: ארבעון (he) m (arba'ón)
- Hindi: चतुष्फलक m (catuṣphalak)
- Hungarian: tetraéder (hu)
- Icelandic: ferflötungur m, fjórflötungur m
- Italian: tetraedro (it) m
- Japanese: 四面体 (ja) (shimentai), 三角錐 (ja) (sankakusui)
- Korean: 사면체 (ko) (samyeonche)
- Norwegian: tetraeder (no) n
- Persian: چهاروجهی (fa)
- Polish: czworościan (pl) m inan
- Portuguese: tetraedro (pt) m
- Romanian: tetraedru (ro) n
- Russian: тетра́эдр (ru) m (tetráedr), четырёхгра́нник (ru) m (četyrjoxgránnik)
- Spanish: tetraedro (es) m
- Swedish: tetraeder (sv) c
- Tagalog: patdayag
- Ukrainian: тетра́едр (uk) m (tetráedr), чотиригра́нник m (čotyryhránnyk)
- Vurës: wanagvet
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regular tetrahedron
- Japanese: 正四面体 (せいしめんたい, seishimentai)
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