Definition:Decagon

Definition

A decagon is a polygon with exactly $10$ sides.

Regular Decagon

A regular decagon is a decagon which is both equilateral and equiangular.

That is, a regular polygon with $10$ sides.

That is, a decagon in which all the sides are the same length, and all the vertices have the same angle:

Also see

• Results about decagons can be found here.

Linguistic Note

The word decagon derives from the Greek deka, meaning ten, and gon, deriving from the Greek for corner.

Sources

• 1989: Ephraim J. Borowski and Jonathan M. Borwein: Dictionary of Mathematics ... (previous) ... (next): decagon
• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): decagon
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): decagon
• 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): decagon
• 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): polygon
• 2021: Richard Earl and James Nicholson: The Concise Oxford Dictionary of Mathematics (6th ed.) ... (previous) ... (next): polygon