Talk:Octadecagon

Formula
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?
Why it is a stub class? --Petrus3743 (talk) 15:30, 25 December 2016 (UTC)

Needs explanation
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?

Jumpow (talk) 11:57, 11 January 2017 (UTC)