I think vertex...
bisector
mk
width
Angle Apothem AxesAxiom
nonagon
V words in giver:VegVieVierVirge
centagan: 100-gon
in geometry, width
There is only one word that starts with the letter E an and with a V. This word is elov.
The word you are looking for is:Trigonometry
How about a decagon which is a ten sided polygon
variable