Hendecagon
A hendecagon or undecagon or 11-gon is a shape with 11 sides and 11 corners.
Regular hendecagon
All sides of a regular hendecagon are the same length. Each corner is 147.27°. All corners added together equal 1619.97°.
Area
The amount of space a regular hendecagon takes up is
- [math]\displaystyle{ \alpha = \frac{(n - 2)}{n} \cdot 180^\circ = \frac{9}{11} \cdot 180^\circ \approx 147{,}273^\circ }[/math]
- [math]\displaystyle{ A = \frac{11}{4}a^2 \cot \frac{\pi}{11} \approx 9,36564a^2 \, }[/math]
a is the length of one of its sides.
Hendecagon Media
Symmetries of a regular hendecagon. Vertices are colored by their symmetry positions. Blue mirror lines are drawn through vertices and edge. Gyration orders are given in the center.
en:Star polygon
en:Star polygon
en:Star polygon
en:Star polygon
