First, calculate distances AB, BC, AC using formula √[(x₂-x₁)²+(y₂-y₁)²]. If AB + BC = AC, points are collinear. This I remember because madam made us chant it like a rhyme in tuition. But in our life, collinear is like me, my sister, and the line for the shared tap water in the morning — always in a straight line, no choice.
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