Answer :

Let the points be


A = (x1, y1) = (3, -2) and


B = (x2, y2) = (-5, 4) and


C = (x3, y3) = (-1, 1)


Now if the points A, B and C are collinear then the area formed by the triangle by joining these three points would be 0


Area of triangle is given by formula


Area = × [x1(y2 – y3) + x2(y3 – y1) + x3(y1 – y2)]


Where (x1, y1), (x2, y2) and (x3, y3) are vertices of triangle


So, if we prove that area of ΔABC = 0 then points A, B and C are collinear


Area = × [3(4 – 1) + (-5)(1 – (-2)) + (-1)(-2 – 4)]


Area = × [9 + (-5)(3) + 6]


Area = × [15 + (-15)]


Area = 0


Hence points (3, –2), (–5, 4) and (–1, 1) are collinear.


Method 2


Another method is that you can find distances between every pair of two points and if any distance is equal to sum of other two distances then points are collinear. Here AC + BC = AB.


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