Three points are said to be collinear if:, Their distances are equal, Area of triangle formed is 1, Area of triangle formed is 0, Their coordinates are same, Centroid divides the median in the ratio:, 1 : 1, 1 : 2, 2 : 1, 3 : 2, Centroid divides the median in the ratio:, 1 : 1, 1 : 2, 2 : 1, 3 : 2.

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