Three-Sided Coin was created on 2002-06-11.
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.
The 11-sided design was chosen to help make the coin easy to tell apart from other coins, especially to help people who are visually impaired or blind. Those of us who are sighted can tell by its color, but for someone who relies on touch the 11 sides distinguish it from similar sized pieces such as quarters and halves.
11-sided QuadrilateralAn 11-sided quadrilateral is called a hendecagon.
An 11 sided shape is an Eptogon
the 11 sided polygon is undecagon
The name of a 11 sided polygon is Hendecagon.
The name of a 11 sided polygon is Hendecagon.
The name of a 11 sided polygon is Hendecagon.
An 11 sided figure is called a hendecagon, an undecagon, or a 11-gon.
An 11 sided polygon is a hendecagon and a 12 sided polygon is a dodecagon