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To measure an angle you must take all the points in between the two. Therefor it could be anywhere from 2 to 100 points.
They must have mass. This is not a particularly stringent or discriminatory requirement.
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a line with arrows on each end. it must have points in between the two arrows
In order for three or more points to be collinear, they must lie on the same line. Two points would always be collinear. Noncollinear are points that do not lie in the same line.