A theorem on regular n-gons (n is even)

[i]AB[/i]=[i]BR[/i]. [i]D[/i] is the vertex number [i]n[/i]/2 if [i]A[/i] is the 0th vertex, [i]B[/i] is the second one, and so on.[br][br]Here n=16.
– Zoltán Kovács

Information: A theorem on regular n-gons (n is even)