# Octahedron

Pronunciation: /ˌɒk.təˈhi.drən/ Explain

 Figure 1: Regular Octahedron.

A octahedron is any eight sided polyhedron.[2] The sides of a regular octahedron are congruent equilateral triangles.

A geometric net is a 2-dimensional drawing that can be cut and folded into a polyhedron. Table 1 has links to printable nets that you can make into octahedra.

Geometric Nets of Octahedra
ImageNameURL
Regular Octahedron or Square Dipyramidnet_regular_octahedron.pdf
Heptagonal Pyramidnet_heptagonal_pyramid.pdf
Hexagonal Prismnet_hexagonal_prism.pdf
Square Trapezohedronnet_square_trapezohedron.pdf
Triangular Cupolanet_triangular_cupola.pdf
Truncated Tetrahedronnet_truncated_tetrahedron.pdf
Table 1: Octahedron nets

### References

1. McAdams, David E.. All Math Words Dictionary, octahedron. 2nd Classroom edition 20150108-4799968. pg 129. Life is a Story Problem LLC. January 8, 2015. Buy the book
2. Stöcker, K.H.. The Elements of Constructive Geometry, Inductively Presented. pp 48-49. Translated by Noetling, William A.M, C.E.. www.archive.org. Silver, Burdett & Company. 1897. Last Accessed 9/5/2018. http://www.archive.org/stream/elementsofconstr00noetrich#page/48/mode/1up. Buy the book

McAdams, David E. Octahedron. 12/21/2018. All Math Words Encyclopedia. Life is a Story Problem LLC. https://www.allmathwords.org/en/o/octahedron.html.

### Revision History

12/21/2018: Reviewed and corrected IPA pronunication. (McAdams, David E.)