Figure, face, or fundamental region.
Figure: a set of points
Face: a polygonal region of a surface
Fundamental region: a region used in a tesselation
fraction.
bisector
mk
width
Angle Apothem AxesAxiom
I think vertex...
nonagon
centagan: 100-gon
in geometry, width
Famished is a word for extremely hungry that starts with the letter F.
How about a decagon which is a ten sided polygon
The word you are looking for is:Trigonometry