What is the difference between parallel lines and perpendicular lines?
Parallel lines never meet and share the same slope; perpendicular lines cross at 90° with slopes multiplying to −1.
Parallel lines never meet and share the same slope; perpendicular lines cross at 90° with slopes multiplying to −1. A reliable way to keep them apart is to focus on what each one is defined by, not just the similar-sounding words.
Key point
parallel lines vs perpendicular lines
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