The shape you're referring to is call a decagon.
You call figures with the same shape and size as congruent shapes. I hope this helped.
A 20-sided shape is called a dodecahedron.
A 12-sided shape is called a dodecagon.
A nine sided shape is called a nonagon.
you call a seven sided shape a heptagon.
pushed out of shape
A regular shape.
A plane shape, if not a 2-d shape.
you call a two dimensional shape with six sides a hexagon
you call it a edge
It is an irregular shape
this shape is called a Pentacontagon
Technically it is not a shape, but the closest shape it comes out to be is a square.
2D shape = Decagon 3D shape = Decahedron
An 11 sided shape is an Eptogon
A shape with 7 sides is a heptagon