Artists use foreshortening and overlapping to create in a work of art.

Foreshortening and overlapping are techniques used for creating the sense of a 3 dimensional object within a 2 dimensional space.
There is also the use of lighting, shading ,etc. but for the most part. In their essence, foreshadowing and overlapping are used to show depth.

Is it even part of math

For #1 i believe the answer would be d. because it is hard to perfect thatfor #3 i believe the answer would be b. because latin root meaning round  for #6 i believe the answer would be a. because it is a jewish thing