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Proof: Criterion for perpendicular lines
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Proof: Criterion for perpendicular lines
The definition for perperdicular lines states that lines are
perpendicular if and only if the product of their slopes is -1. Let us
see if that is true.
The definition for perperdicular lines states that lines are
perpendicular if and only if the product of their slopes is -1. Let us
see if that is true.
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