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`A = 11/4 * ( "s" )^2 * cot(pi/11)`

Enter a value for all fields

The **Area of a Hendecagon** calculator computes the area of a regular hendecagon, a polygon with 11 equal sides of length (**s**).

**INSTRUCTIONS:** Choose units and enter the following:

- (
**s**) - This is the length of the sides of the hendecagon

**Area of a Hendecagon (A):** The area (**A**) is computed in square meters. However, the area can be automatically converted to many other area units (e.g. acres) via the pull-down menu.

For the Volume of a Hendecagon shaped column, CLICK HERE.

A regular hendecagon has eleven equal sides and equal angles. The formula for the area of a hendecagon is as follows:

**A= ^{11}/_{4} • cot(^{π}/_{11}) • s^{2}**

where **s** is the length of a side.

A regular hendecagon has eleven equal sides and equal angles. For computational performance, `11/4 * cot(pi/11)` is approximated to be 9.365639907.

- Area of a Circle - Multiple functions to compute the area of a circle or portions of a circle.
- Area of Triangle - Three Sides
- Area of Quadrilateral - Four Sides
- Area of Pentagon - Five Sides
- Area of Hexagon - Six Sides
- Area of Heptagon - Seven Sides
- Area of Octagon - Eight Sides
- Area of Nonagon - Nine Sides
- Area of Decagon - Ten Sides
- Area of Hendecagon - Eleven Sides
- Area of Dodecagon - Twelve Sides
- Area of Polygon - Any number of sides (n).