It is enneadecagon (or enneakaidecagon or nonadecagon).
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A polygon with 6 sides is called a hexagon.
it has 19 sides (:
A polygon is a closed figure bounded by sides only. Triangle is the polygon of 3 sides and 3 vertices.
It must have 19 sides to comply with the formula:- 0.5*(192-(3*19)) = 152 diagonals
HexagoN