Angle Apothem Axes
Axiom
bisector
mk
I think vertex...
nonagon
width
in geometry, width
centagan: 100-gon
The word you are looking for is:Trigonometry
How about a decagon which is a ten sided polygon
Kite is one of them which is a 4 sided quadrilateral
kite- A quadrilateral that has two distinct pairs of consecutive equilateral sides
elliptic - a kind of non-Euclidean geometry.