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If only one curves, then eventually the curve will intersect with the other line, even if it is way down into infinity ona graph. If both lines curve at the same angles at the same rate however, staying equidistant from each other, they are still parallel and will never intersect.
Lines that that intersect each other at right angles on a plane are perpendicular lines.
Perpendicular lines intersect at right angles to each other.
The diagonals of every quadrilateral must intersect.
No but they do intersect each other at 90 degrees