nonacontagon
You can name the sides any way you like.
Hexagons
The only regular polygon with an interior angle of 90 degrees is the square, which has four sides. Other polygons can have an interior angle of 90 degrees, but they would not be regular polygons.
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pentagon
polologous
It means many sides
Shapes with straight sides are called polygons
Quadrilaterals are polygons with four sides. Triangles are polygons with three sides.
a quadrilateral, or Tetragon, or Quadrangle
Regular polygons.
nonagon(also called an enneagon)