Parallel is lines that never touch so if the lines never touch it is parallel but if so then it is perpendicular.
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A check that has been cashed and returned to you or has been striked off and marked as cancelled by the person who issued it. This is done by drawing two parallel lines across the check (diagonally) and writing "Cancelled" between the two lines. This is called Cancelling a check and once done, the check is null and void
yes, two lines can be coplanar.
Two lines cross or intersect at a point.
An ellipse has two lines of symmetry.
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