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Three points lying on one straight line are said to be:

ACoplanar
BConcurrent
CCongruent
DCollinear
Answer & Solution
Correct answer: D. Collinear
1. The three points do not form a triangle. 2. They all fall along a single line. 3. Such points are called collinear. _Source: syllabus Mathematics, Chapter 10, Straight Lines._
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