I"ve just started looking in ~ the axioms that 3D Geometry. The first one that i encountered is this one:

"Three non upright points define a plane" or " given three non collinear points, just one plane goes with them"

I know that it is one axiom and it is taken to be true however I don"t understand the intuition behind it. I know that if ns take one allude or any variety of collinear points, then i can draw infinite planes just by rotating about the line the connects these points, yet why carry out we need 3 non upright points to define a plane, why no more? and why, offered three non collinear points, does just one airplane go with them? Why not two or three?


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Two points recognize a heat (shown in the center). There space infinitely countless infinite planes the contain the line. Only one airplane passes through a point not collinear with the initial two points:

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Two points identify a heat $l$. Thus, together you say, girlfriend can draw infinitely numerous planes containing these points simply by rotating the line containing the 2 points. So you find a set of infinitely plenty of planes include a usual line. Because that any 3rd point no on $l$ climate there is only one of these plane containing it.

You are watching: Two dimensional using 3 noncollinear points

An analogy is the same difficulty is reduced dimension. Take a suggest in a plane. There room infinitely numerous lines through it. Now take a second point various from the first. Then there is a distinctive line amongst the infinitely many given that includes the 2 points.


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A plane is a vectorial room whose dimension is $ 2$.its base consists of exactly two independent vectors.If your 3 points $ A,B,C $ do not lied in the exact same line, you deserve to take as a base, the pair $ (vecAB,vecAC) $.


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