Tetradecagon.
A 2D shape with 9 sides is called a Nonagon.
Square
hexagon
Octagon
It is a Heptagon.
A triangle as no other 2d shape can have 3 sides.
A twenty sided, 2D figure is called an icosagon.
A ten-sided 2D polygon is known as a decagon.
The shape of 2D is a flat surface.
in 2d shapes a quadrilateral
A quadrilateral.
A 2D shape that has four sides and is thirteen letters long is a quadrilateral.