The highly technical term is "BLOB"!
An irregular shape!
A shape that does not have equal sides is called an irregular shape.
a quadrilateral
A shape with 9 unequal sides would be called an irregular nonagon or an irregular enneagon.
trapezoid
An irregular shape!
An irregular shape can be called a blob.
Irregular
An irregular hexagon.
It is an IRREGULAR shape.
They are called 'irregular galaxies"
Not surprisingly, it would be called an irregular galaxy.
A shape that does not have equal sides is called an irregular shape.
There is no formula. That's why it's called irregular!
An octagon. Or more specifically, an irregular octagon.
a quadrilateral
an irregular polygon