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http://mathhelpboards.com/math-notes-49/perpendicular-lines-product-their-slopes-2953.html

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http://mathhelpboards.com/math-notes-49/perpendicular-lines-product-their-slopes-2953.html

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- Jan 26, 2012

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Thank you...I stumbled upon that helping a student at another site to find the third vertex of a right triangle, when given two of the vertices in the plane, and the leg lengths. When I realized I had found a nice method to show the product of the slopes of perpendicular lines is -1, I raced here to add it to this topic.