The skew lines are CG, DH, AD, BC.
The parallel lines are BC, EH, FG.
What is skew lines?
Two or more lines which have no intersections but are not parallel.
As, by the definition
The lines skew to EF is CG, DH, AD, BC
The parallel to AD is BC, EH, FG.
Learn more about skew lines here:
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