2 points determine a straight line and are always, by definition, collinear.
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False. Three collinear points determine a line while three non-collinear points determine a plane ( A Triangle)
Yes.
If points B and C are collinear, it means that they lie on the same straight line. To determine if points B and C are collinear, you would need to know the coordinates or have a visual representation of the points.
For instance a plane.
Three non-collinear points do not determine a unique spherical triangle.