A hendecagon.
hendecagon
An 11-sided figure is a hendecagon, or an undecagon. Either name applies.
The best name seems to be hendecagon (from the Greek word for "eleven").See http://mathworld.wolfram.com/Hendecagon.html.
odecogon
a hendecagon has 11 sides =)
A polygon with 11 sides is called an "undecagon."
yes!, and i am a 11 year old boy.
A hendecagon or endecagon.
Hendecagon.
An undecagon, or figure with 11 sides. has an interior angle of 147o
Endecagon (or hendecagon) and dodecagon.
A two-dimensional eleven-sided figure is called a hendecagon.