The meaning of collinear is, lying on a same straight line. So, if the points lie on a straight line, they are called collinear points. Actually, two points are commonly used to represent a ray, a line segment and a straight line graphically. Displaying more than two points on a line is unusual. However, it is essential to show more than two points on a line to know about a case.
Actually, a straight line passes through some points on a plane to form a line. Those points are actually part of the plane, now become part of the line too and they lie on the same straight line. Therefore, the points which lie on a line are called collinear points. Considering the representation of a line, if three or more than two points are displayed on a line, they are called collinear points.
Consider a straight line . It is having two points and on the same line. , , and are total four points and all four points lie on the same straight line. The total points are more than two and lie on the same straight line.
Therefore, the points , , and are collinear points.
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