A ten-sided 2D polygon is known as a decagon.
this shape is a decagon this shape is a decagon
Any 4 sided 2D shape
A 2D shape with forty sides is known as a tentracontagon.
Such a 2D shape is a hexagon, a six sided figure.
A quadrilateral is a 2D shape that has 4 sides
A 2D shape with 9 sides is called a Nonagon.
It is the decagon.
this shape is a decagon this shape is a decagon
Square
hexagon
Tetradecagon.
Octagon
2D shape = Decagon 3D shape = Decahedron
It is a Heptagon.
A triangle as no other 2d shape can have 3 sides.
A twenty sided, 2D figure is called an icosagon.
The shape of 2D is a flat surface.