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-   -   3 points make a plane? (http://www.physicsforums.com/showthread.php?t=252440)

redretro Aug28-08 06:54 PM

3 points make a plane?
 
If three points make a plane? what does four make 1 also until you reach 6 how does that system work?

chroot Aug28-08 07:07 PM

Re: 3 points make a plane?
 
Four points would define a hyperplane (literally, a 4-dimensional plane), but do not necessarily define a normal 3-dimensional plane -- they may not be coplanar.

In the same way, three points define a normal 3-dimensional plane, but do not necessarily define a line -- they may not be collinear.

- Warren


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