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`A = 5/2 * ( "s" )^2 * sqrt(5 +2sqrt(5))`

Enter a value for all fields

This **Area of a Decagon** formula, (**A _{decagon}=^{5}/_{2 }• √(5+2√5) • s^{2}**), computes the area of a regular decagon, a polygon with 10 equal sides of length (

Choose your length units (e.g. feet, meters or even angstrom or light-years), and then enter the following:

**s**- the length of the sides of the decagon

Area is calculated in square meters. However, you can automatically convert the area to other area units such as square feet or acres via the pull-down menu.

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

A regular decagon has ten 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).