A 2D shape with 9 sides is called a Nonagon.
a 2d shape with 5 sides is PENTAGON.
A triangle as no other 2d shape can have 3 sides.
It is a Heptagon.
A ten-sided 2D polygon is known as a decagon.
A twenty sided, 2D figure is called an icosagon.
The shape of 2D is a flat surface.
in 2d shapes a quadrilateral