Icosahedron (EntityTopic, 12)
From Hi.gher. Space
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| - | {{Shape|Icosahedron|http:// | + | {{Shape|Icosahedron|http://fusion-global.org/share/icosahedron.png|3|20, 30, 12|0|{[[Triangle|3,]]5}|<nowiki>5 | 2 3 </nowiki>|''Unknown''|N/A|Regular [[pentagon]], edge 1|Ike|[[Dodecahedron]]|N/A|N/A|N/A|none|''Unknown''|''Unknown''|[[Triangle|3]]<sup>5</sup>}} |
== Geometry == | == Geometry == | ||
=== Equations === | === Equations === | ||
Revision as of 11:30, 17 September 2007
Geometry
Equations
- Assumption: Icosahedron is centered at the origin.
- Variables:
l ⇒ length of edges of the icosahedron
- The hypervolumes of an icosahedron are given by:
total edge length = 30l
surface area = 5sqrt(3)l2
volume = 5l3(3+sqrt(5))12-1
- The planar cross-sections (n) of an icosahedron are:
Unknown
| Notable Trishapes | |
| Regular: | tetrahedron • cube • octahedron • dodecahedron • icosahedron |
| Direct truncates: | tetrahedral truncate • cubic truncate • octahedral truncate • dodecahedral truncate • icosahedral truncate |
| Mesotruncates: | stauromesohedron • stauroperihedron • stauropantohedron • rhodomesohedron • rhodoperihedron • rhodopantohedron |
| Snubs: | snub staurohedron • snub rhodohedron |
| Curved: | sphere • torus • cylinder • cone • frustum • crind |
