What is a Nonagon in Math?

A polygon is a closed shape made of line segments.

Answer: Nonagon is a 9-sided polygon.

Polygon is named after the number of sides it has.

Explanation:

A polygon with 9 sides is called an enneagon,  9-gon, or a Nonagon.

The name is based on the greek numbers.

Thus, nonagon is a 9-sided polygon.