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Q: When three points lie on a line you can say that one of them is the other two?

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They lie in the same plane, but they don't necessarily have to lie on the same line. Every triangle consists of three points that are coplanar but non-colinear.

Three or more points that lie on the same straight line are called Collinear.

true

You have to have three or more points to have non-colinear points because any two points determine a line. Noncolinear are NOT on the same line.

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if there are three or more points not all of which lie on the same line then they are known as non linear pointsif there are specifically three points not all of which lie on the same line then they are known as coplanar points as they will always lie on one plane

If three points all lie on the same line, then the points are said to be "collinear". This is also true if the slope from each point to the next is the same.

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Three or more points are collinear if they lie on the same straight line.Three or more points are collinear if they lie on the same straight line.Three or more points are collinear if they lie on the same straight line.Three or more points are collinear if they lie on the same straight line.

They lie in the same plane, but they don't necessarily have to lie on the same line. Every triangle consists of three points that are coplanar but non-colinear.

Collinear

Two points (which must lie on a line) and the third point NOT on that line.

Not necessarily. Coplanar means that points lie on the same plane whereas collinear means that points lie on the same line. Points on a plane do not necessarily lie along the same line.

Three or more points that lie on the same straight line are called Collinear.

true

Collinear points are points that lie on the same line. Noncollinear points do not lie on the same line. Any two points are always collinear, i.e. forming a line. Three or more points can be collinear along a single line.Collinear points lies on the same straight line.

they do, if the line is curved, otherwise it is infinitely unlikely, but possible that they lie on a straight line