There are many types of symbols used in drafting. Diagonal lines, a.k.a. crosshatch, are used in orthographic views to show that the plane in which the current view lies, goes through a portion of the "part" being drafted.
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it is a line that is slanted either left or right.
Assuming that you mean diagonal (not diagnol) lines, they are straight lines that join non-adjacent vertices in a polygon or polyhedron.
Jagged lines have toothed/serated edges whereas diagonal lines can have any edge so long as they run diagonally,so it is possible to have a jagged diagonal line!
yes
Yes its 2 diagonal intersect at right angles