> They do have an orientation, depending on the order in
> which the vertices are listed. If we number the vertices
> of a triangle clockwise a,b, and c then (b-a)x(c-a)
> always points outwards (with the 'x' denoting
> the cross product. This crossproduct points in the
> direction of the normal on the surface and the length is
> the size of the triangle).
Is this a right-handed or a left-handed crossproduct and
isn't it 2 times the triangle Area?

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