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Question: What is a Decagon ?

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: