An undecagon
no
I assume that, by "Loonie", you mean the Canadian coin. Strictly speaking, it is not a polygon because its sides are not straight lines but if they were, it would be a regular hendecagon - an 11-sided regular polygon.
undecagon
A hendacagon is a polygon with 11 sides.
A polygon with 11 sides is an undecagon
how many diagonals are there iin a polygon of 11 sides
Hendecagon has 11 sides
An irregular polygon
A polygon with 11 sides is called an "undecagon."
Hendecagon.
A heptagon
An undecagon
no
11 sides
It all depends on what kind of polygon it is. It may have no congruent sides or all congruent sides.
A decagon is a polygon that has 10 sides