They are called hendecagons.
They are called endecagons or hendecagons.
It is called a hendecagon.
Hexagon
the 11th sides of polygon is called UNDECAGON....... the 12th sides is DODECAGON.....
It is a polygon that has 3 or more sides
You would call them congruent or similar.
Endecagon (or hendecagon) and dodecagon.
well the name of shapes that has four sides are called quadrilateral its called.
as shape with four sides is generally a squre but a group of shapes with four sides are called quadrelaterals
10 sided shapes are known as decagons.
Hexadecagon (16 sides) and Octadecagon (18 sides) both fit. Am I missing something?