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How do you know if two non-vertical lines are perpendicular? - Answers
They are perpendicular if their slopes are mutual negative reciprocals.
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How do you know if two non-vertical lines are perpendicular? - Answers
https://math.answers.com/math-and-arithmetic/How_do_you_know_if_two_non-vertical_lines_are_perpendicular
They are perpendicular if their slopes are mutual negative reciprocals.
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How do you know if two non-vertical lines are perpendicular? - Answers
They are perpendicular if their slopes are mutual negative reciprocals.
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