A hendecagon is a polygon with 11 sides and 11 vertices.
A regular hendecagon is a polygon with 11 equal sides and angles.
Angles of the Hendecagon
The sum of interior angles of a hendecagon = (11 − 2) · 180° = 1,620°
The value of an interior angle of a regular hendecagon is: 1,620º : 11 = 147.27º
The central angle of a regular hendecagon measures: 360º : 11 = 32.73º
Diagonals of the Hendecagon
The number of diagonals in a regular hendecagon = 11 · (11 − 3) : 2 = 44
Perimeter of a Regular Hendecagon
Perimeter = 11 · l
Area of a Regular Hendecagon