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If AB plus BC equals AC for three points A, B and C, the points are:

AConcyclic
BConcurrent
CCoplanar
DCollinear
Answer & Solution
Correct answer: D. Collinear
1. The two shorter distances add up to the longest. 2. B lies exactly on the segment AC. 3. So the points are collinear. _Source: syllabus Mathematics, Chapter 7, Coordinate Geometry._
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