Drexel dragonThe Math ForumDonate to the Math Forum

Ask Dr. Math - Questions and Answers from our Archives
_____________________________________________
Associated Topics || Dr. Math Home || Search Dr. Math
_____________________________________________

Pentagram


Date: 12/08/2001 at 13:09:15
From: Stephanie Shipwash
Subject: Polygons

Is a 5-pointed star (on a flag), a decagon, or just 5 triangles?

Thanks,
Stephanie


Date: 12/08/2001 at 13:18:20
From: Doctor Sarah
Subject: Re: Polygons

Hi Stephanie - thanks for writing to Dr. Math.

See George Hart's Web page on Pentagrams:

   http://www.georgehart.com/virtual-polyhedra/pentagram.html   

"Pentagrams are "five-pointed stars." They are regular polygons with 
five vertices and five edges; that's all. 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."

- Doctor Sarah, The Math Forum
  http://mathforum.org/dr.math/   
    
Associated Topics:
Elementary Definitions
Elementary Geometry
Elementary Triangles and Other Polygons
Middle School Definitions
Middle School Geometry
Middle School Triangles and Other Polygons

Search the Dr. Math Library:


Find items containing (put spaces between keywords):
 
Click only once for faster results:

[ Choose "whole words" when searching for a word like age.]

all keywords, in any order at least one, that exact phrase
parts of words whole words

Submit your own question to Dr. Math

[Privacy Policy] [Terms of Use]

_____________________________________
Math Forum Home || Math Library || Quick Reference || Math Forum Search
_____________________________________

Ask Dr. MathTM
© 1994-2013 The Math Forum
http://mathforum.org/dr.math/