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it is, unless all three points are in the same line

(Your "Why" should have be "When")

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Q: Why is a plane not defined by three given points?
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Can each plane be uniquely defined by three points?

Yes, a plane can be uniquely defined by three points as long as the three points are not colinear. (Three points are colinear if there is a straight line that passes through all three points.)


Can 3 points be non-coplanar is outside the plane?

If you are given a plane, you can always find and number of points that are not in that plane but, given anythree points there is always at least one plane that goes through all three.


What is advantage of three legged stool?

A plane is defined by three points, so a three legged stool is stable because the points on the end of the stool's legs are coplanar


In geometry is it true that through any three points exists exactly one line?

No, given any three points, it is possible for one of the points not to be on the line defined by the other two points. Only two points on a line are needed to identify the exact position of the line. The positions of any three points gives you the exact position of the plane that includes those three points.No, it is not true. If it were true, all triangles would be straight lines !?!


In general how many planes are there which contain any number of given points?

There are no planes containing any number of given points. Two points not the same define a line. Three points not in a line define a plane. For four or more points to lie in the same plane, three can be arbitrary but not on the same line, but the fourth (and so on) points must lie in that same plane.


Can a circle pass through three given points?

Yes, if they are all in the same plane.


What would happen if three collinear points are used to define a plane?

Three collinear points don't define a plane."Define" means narrow it down to one and only one unique plane, so that it can't be confused with any other one.There are many different planes (actually infinite) that can contain three collinear points, so no unique plane is defined.


Can two points be noncoplanar?

Any three given points can be joined by a common plane, and any two given points can be joined by a common line and an infinite number of common planes.


Give a line and a point not on the line how many planes do they define?

They define one plane. A line is defined by two points, and it takes three points to define a plane, so two points on the line, and one more point not on the line equals one plane.


What do three points form in geometry?

A plane is named by three points in the plane that is not on the same line.


How many points make a plane?

It takes three points to make a plane. The points need to be non-co-linear. These three points define a distinct plane, but the plane can be made up of an infinite set of points.


Three points that determine a plane?

Any 3 points determine a plane.