Prove that by joining the points (2,1) (3,4) (-3,6) are get a right angle?

Hi, Let A2,1, B3,4 and C-3,6So slope of AB= 4-13-2= 3 slopw of BC = 6-4-3-3= -13So product of these slope m1m2= 3×-13= - 1So they will form right angle triangleRegards

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