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
Hendecagon.
A heptagon
A polygon with 11 sides is called an "undecagon."
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