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Parallel lines are two lines in a plane that never meet, no matter how far they extend. Perpendicular lines are two lines that intersect at a 90-degree angle, forming four right angles. The key difference is in their orientation: parallel lines never intersect, while perpendicular lines intersect at a right angle.
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In a plane, parallel lines are two lines that never meet no matter how far they extend, while perpendicular lines are two lines that intersect at a 90-degree angle to form four right angles. The main distinction between the two is that parallel lines never intersect whereas perpendicular lines always do at a right angle.