No circulating US coin has 11 sides.
Early designs for the Susan B. Anthony dollar (1979-81 and 1999) had 11 sides. However the final design had a standard round edge with an 11-sided interior border. The US Mint felt it was impractical to strike a multisided coin despite the fact that other countries had been doing so for many years.
The Susan B. Anthony dollar.
a shape with eleven sides is called a undecagon
An eleven sided shape is called a hendecagon.
a heptagon is a shape with 11 sides!
The hendecagon is a polygon with eleven sides.
Abraham Lincoln
There are 11 times 5 = 55 sides in 11 pentagons.
Eleven.
Hendecagon or undecagon
It is a hendecagon.
8
Eleven.