can distance formula also be used for proving that points are collinear?whether both formula are correct? I mean distance formula and area of triangle?
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In general, three points A, B and C are collinear if the sum of the lengths of any two line segments among AB, BC and CA is equal to the length of the remaining line segment, that is, either AB + BC = AC or AC +CB = AB or BA + AC = BC....... ....
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