Talk:Octadecagon
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Formula[edit]
Is there a formula for this shape? --Rocket50 (talk) 00:49, 29 March 2009 (UTC)
- For any number n, the vertices of a regular n-gon can be drawn on the unit circle with vertices at (cos(2πj/n),sin(2πj/n)) for 0≤j<n. Does that help? —Tamfang (talk) 00:41, 26 April 2012 (UTC)
A stub?[edit]
Why it is a stub class? --Petrus3743 (talk) 15:30, 25 December 2016 (UTC)
Needs explanation[edit]
Fragment
The regular octadecagon has Dih18 symmetry, order 36. There are 5 subgroup dihedral symmetries: Dih9, (Dih6, Dih3), and (Dih2 Dih1), and 6 cyclic group symmetries: (Z18, Z9), (Z6, Z3), and (Z2, Z1). These 15 symmetries can be seen in 12 distinct symmetries on the ...
needs axplanation.
- Where from appears These 15 symmetries? Please, explain.
- What 12 distinct symmetries? Please, explain.
- Where 5 dihedral subgroups and 6 cyclic group symmetries appear in following text?
- Where I can read about These 15 symmetries fnd 12 distinct symmetries?