polygon with 18 sides From Wikipedia, the free encyclopedia
A octadecagon or 18-gon is a shape with 18 sides and 18 corners.
All sides of a regular octadecagon are the same length. Each corner is 160°. All corners added together equal 2880°.
The amount of space a regular octadecagon takes up is
The area of a regular octadecagon of side length a is given by
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.