Icosahedron Day

Today is a day to celebrate the regular icosahedrons. The regular convex icosahedron is one of the platonic solids, though there is also a regular concave icosahedron named the Great Icosahedron.

A regular icosahedron is formed by putting 20 identical equilateral triangles together into a convex or concave polyhedron. It will have 12 vertices, 20 faces, and 30 edges. (A non-regular icosahedron would can consist of any polyhedron with 20 faces with a variety of vertices and edges.)

We celebrate icosahedrons on March (3rd month) 20 because it's composed of triangles (3 sides), and 20 of them.

By Theon at French Wikipedia - own work. Transferred from fr.wikipedia to Commons.; Transfer was stated to be made by Theon., GFDL, https://commons.wikimedia.org/w/index.php?curid=3563566



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