Open main menu
Home
Random
Recent changes
Special pages
Community portal
Preferences
About Wikipedia
Disclaimers
Incubator escapee wiki
Search
User menu
Talk
Dark mode
Contributions
Create account
Log in
Editing
Dodecahedron
(section)
Warning:
You are not logged in. Your IP address will be publicly visible if you make any edits. If you
log in
or
create an account
, your edits will be attributed to your username, along with other benefits.
Anti-spam check. Do
not
fill this in!
====Cartesian coordinates==== The eight vertices of a cube have the coordinates (±1, ±1, ±1). The coordinates of the 12 additional vertices are <big>(</big>0, ±(1 + ''h''), ±(1 − ''h''<sup>2</sup>)<big>)</big>, <big>(</big>±(1 + ''h''), ±(1 − ''h''<sup>2</sup>), 0<big>)</big> and <big>(</big>±(1 − ''h''<sup>2</sup>), 0, ±(1 + ''h'')<big>)</big>. ''h'' is the height of the [[wedge (geometry)|wedge]]<nowiki>-shaped</nowiki> "roof" above the faces of that cube with edge length 2. An important case is ''h'' = {{sfrac|1|2}} (a quarter of the cube edge length) for perfect natural pyrite (also the pyritohedron in the [[Weaire–Phelan structure]]). Another one is ''h'' = {{sfrac|1|[[Golden ratio|φ]]}} = 0.618... for the [[regular dodecahedron]]. See section ''[[#Geometric freedom|Geometric freedom]]'' for other cases. Two pyritohedra with swapped nonzero coordinates are in dual positions to each other like the dodecahedra in the [[compound of two dodecahedra]]. {| | {{multiple image |align=left |total_width=440 | image1 = Polyhedron pyritohedron from yellow max.png | image2 = Polyhedron pyritohedron from red max.png | image3 = Polyhedron pyritohedron from blue max.png | footer = Orthographic projections of the pyritohedron with ''h'' = 1/2 }} | {{multiple image |align=left |total_width=278 | image1 = Polyhedron pyritohedron max.png | image2 = Polyhedron 12 pyritohedral max.png | footer = Heights 1/2 and 1/[[Golden Ratio|''φ'']] }} | |} {| class="wikitable collapsible collapsed" style="text-align: center;" !colspan="2"| Animations |- style="background-color: white;" |style="width: 350px;"| [[File:Endo-dodecahedron honeycomb.gif|200px]] |style="width: 350px;"| [[File:Pyritohedron animation.gif|200px]] |- | [[Honeycomb (geometry)|Honeycomb]] of alternating convex and concave pyritohedra with heights between ±{{sfrac|1|[[Golden ratio|φ]]}} | Heights between 0 (cube)<br>and 1 (rhombic dodecahedron) |}
Edit summary
(Briefly describe your changes)
By publishing changes, you agree to the
Terms of Use
, and you irrevocably agree to release your contribution under the
CC BY-SA 4.0 License
and the
GFDL
. You agree that a hyperlink or URL is sufficient attribution under the Creative Commons license.
Cancel
Editing help
(opens in new window)