`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)•s²), computes the area of a regular nonagon, a polygon with 9 equal sides of length (s).   Regular Nonagon

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.

The Math

A regular nonagon has nine equal sides and equal angles.

For other area calculators, see the following:

• 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).