Origin of pentahedron
"pentahedron." YourDictionary, n.d. Web. 13 October 2018. <http://www.yourdictionary.com/pentahedron>.
pentahedron. (n.d.). Retrieved October 13th, 2018, from http://www.yourdictionary.com/pentahedron
(plural pentahedrons or pentahedra)
penta- +"Ž -hedron
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