What is nondecagon?

A nondecagon is a polygon with ten sides and ten angles. The sum of the interior angles of a nondecagon is 1440 degrees. The exterior angles of a nondecagon add up to 360 degrees, with each exterior angle measuring 36 degrees. A regular nondecagon has all its sides of equal length and all its angles of equal measure. A nonregular nondecagon has sides and angles of different lengths and measures. Nondecagons are not commonly used in geometry, and they do not have unique properties or applications.