Quick answer
A hendecagon is a polygon with 11 sides.
- Main formula
- Regular perimeter = 11 x side; regular area = (perimeter x apothem)/2.
- Quick example
- If each side measures 4, the perimeter is 44.
Definition
A hendecagon is a closed polygon formed by 11 line segments.
Regular hendecagon
In a regular hendecagon, all sides and all interior angles are equal.
Formulas
- Perimeter of a regular hendecagon: P = 11s.
- Area of a regular hendecagon: A = (P x a)/2, where a is the apothem.
Example
If a regular hendecagon has side length 4, then P = 11 x 4 = 44.