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Three points are collinear if the area of the triangle formed by them is
Aone
Bnegative
Cundefined
Dzero
Answer & Solution
Correct answer: D. zero
1. Collinear points lie on a single straight line.
2. Then they cannot form a triangle, so the enclosed area is **zero**.
3. Setting the area formula equal to 0 is the test for collinearity.
_Source: Karnataka SSLC (KSEEB) Class 10 Mathematics, Ch7 'Coordinate Geometry', §7.4_
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