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skew lines are noncoplanar lines, which means they aren't parallel and they also don't intersect   skew lines do not intersect and are not coplanar.
1989, p. 539). This is equivalent to the statement that the vertices of the lines are not coplanar, i.e., (4). Three skew lines always define a one-sheeted hyperboloid, except in the case where they are all parallel to a single plane but not to each other.