noun Geometry. a polygon having ten angles and ten sides.

What is the meaning of decagon in English?

: a plane polygon of 10 angles and 10 sides.

What is decagon math?

A decagon is a closed shape with ten sides and ten angles. Your geometry teacher would also tell you that a decagon is a polygon. ... Speaking of math class, in geometry you may learn that a "regular decagon" is one with sides that are all equal to each other and with internal angles that all measure 144 degrees.