fraction.
elliptic - a kind of non-Euclidean geometry.
There are no geometry terms that start with the letter J. Geometry deals with the spatial relationships of objects.
Geometry
bisector
mk
base
width
Angle Apothem AxesAxiom
I think vertex...
geometry
parallelogramperimeterpentagonprismproofprotractorPythagorean Theorem
nonagon