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

Enter a value for all fields

This **Area of a Nonagon** calculator computes the area of a regular nonagon, a polygon with 9 equal sides of length (**s**).

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

**(s)**Length of Nonagon Sides

**Nonagon Area (A): **The area is returned in square meters. However, this can be automatically converted to compatible units via the pull-down menu.

A regular nonagon has nine equal sides and equal angles. The formula for the area of a nonagon is:

A =9/4•cot(π/9)•s^{2}

where:

- A = area of a regular nonagon
- s = length of a side

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