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{{ printedBook.courseTrack.name }} {{ printedBook.name }} Any set of two or more points that lie on the same line are said to be **collinear**.

In this illustration, $A,$ $B,$ and $C$ are all considered to be collinear while $D$ does not lie on the same line as the other points.

However, since any two points can be used to define a line, $D$ is still considered to be collinear with the other points individually. Therefore, there are $4$ sets of collinear points on the graph. $ {A,B,C}{A,D}{B,D}{C,D} $