There are no geometry terms that start with the letter J. Geometry deals with the spatial relationships of objects.
Presumably at the birth of the Universe.
Tangent.
altitude
Geometry
eicosohedron
Presumably at the birth of the Universe
right.
Starting from around 3rd-4th grade, you start to learn really basic geometry. But around 8th or 9th grade, you actually start to learn more advanced geometry that uses theorems and postulates and proofs.
300 bc by euclid a greek mathmatician.
Skew
formula