If a triangle has vertices P (6, 7), Q(2 -1) and R(-2, 1) How do I use the slopes of the sides to show that it is right angled?

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- Oct 30th 2008, 02:40 PMmattymath help.. a right-angled triangle
If a triangle has vertices P (6, 7), Q(2 -1) and R(-2, 1) How do I use the slopes of the sides to show that it is right angled?

- Oct 30th 2008, 05:04 PMskeeter
perpendicular lines have slopes that are opposite reciprocals