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`A = 9/4 * cot (pi/9) * ( "s" )^2`

Enter a value for all fields

This **Area of a Nonagon** formula, (**A = ^{9}/_{4}•cot(^{π}/_{9})•s^{2}**), computes the area of a regular nonagon, a polygon with 9 equal sides of length (

**INSTRUCTIONS:** Choose your length units (e.g. feet or meters), and enter the following:

**s**- the length of the sides of the nonagon

The area (**A**) is returned in square meters, but can be automatically converted to many other area units via the pull-down menu.

To compute the Volume of a Nonagon shaped column, CLICK HERE.

A regular nonagon has nine equal sides and equal angles.

- 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).