Skew lines<span> are two </span>lines<span> that do not </span>intersect<span> and are not </span>parallel. <span>Two lines that both lie in the same plane must either cross each other or be parallel, so skew lines can exist only in three or more </span>dimensions<span>. Two lines are skew if and only if they are not </span>coplanar<span>.</span>
