It is called an octogan.
octogon or octogan
A hexagon is a rigid shape.
An octogan It wouldn't be an octogan unless all the sides were the same length. OCTO means 8
yes a pentagon is a rigid shape * * * * * I am afraid that it is not.
An irregular octogan?
This is a misguided question since a pentagon is NOT a rigid shape.
It is a 2D shape
liquids are Not rigid in shape, but DO have a fixed volume