Answer:
A Decagon is a polygon with 10 sides. When all of its sides
and angles are equal it is said to be regular.
In geometry, a decagon is any polygon with ten sides and ten
angles, and usually refers to a regular decagon, having all
sides of equal length and all angles equal to 144°, therefore
making each angle of a regular decagon be 144°.
Example of a Decagon:
