# Vectors Problem

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• Dec 11th 2008, 02:34 PM
Ataxia
Vectors Problem
http://i87.photobucket.com/albums/k1...ectorsprob.gif

I'm not quite sure what I'm being asked to prove here. I presumably have to show that P satisfies some equation that shows it is a plane and not some other kind of surface but I don't know what that equation is.
• Dec 11th 2008, 03:55 PM
Skalkaz
Dear Ataxia,

If you use a vector formalism, the equation of the plane is same in 3 or 4 or other dimension.

Let n is a normal, so it is perpendicular to the plane, therefore their inner product (or scalar product) is null. So the equation is:
$\vec n \cdot \vec r = 0$