Polygon
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1 Equilateral triangle, 2 Square, which is a special case of 3 Rhombus, 4 Pentagon with equal sides, 5 Hexagon with equal sides etc etc
A nonagon is a 2 dimensional shape that has nine sides. A polygon on the other side refers to a plane that is 2D and has three straight sides.
It is the decagon.
Hexagon
a line