How many vertices are on a five-pointed star?

Pentagrams are five-pointed stars. They are regular polygons with five vertices and five edges. The sides just happen to cross each other at five points of intersection which outline the small interior pentagon, but those are not vertices and the smaller segments are not complete sides. Mathematically, the pentagram is special for being the simplest nonconvex regular polygon.

kerry8888 says:

my understanding of a pentagram (5 pointed star) is that it has 5 vertices and 10 edges as per the drawing in this site....

Mon May 26 08:35:14 CDT 2003

kerry says:

oops sorry
http://www.primepuzzles.net/puzzles/puzz_013.htm

Mon May 26 08:35:43 CDT 2003
(As one entry - McG)