Three points lie on a line when the area of the triangle they form is:
AFour
BFive
CZero
DNine
Answer & Solution
Correct answer: C. Zero
1. Three points that are not in a line enclose a genuine triangle.
2. If they are in a line the triangle collapses flat.
3. If the area of the triangle is zero, the three points are collinear.
4. So a zero area is the test for collinearity.
_Source: NCERT Class XI Mathematics, Ch 9 'Straight Lines'_
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