Nieminen Mika wrote:

>   Your definition is absolutely right, but the original definition is too.
>   Cross product can also be formulated as:
> 
>   AxB = |A| * |B| * sin(angle(A,B)) * perpendicular_unit_vector(A,B)
> 
>   So the length is proportional to the angle between them.
>   Perhaps it should have a better wording, though.

proportionality between the angle and the sine of an angle is only true
for very small angles (if you use radians to define the angle) 
   
    abs(alpha)<0.3   =>  alpha = sin(alpha) +/- 0.5%

I think it's more usefull for those non-mathematicians out there to read
that the length of the cross product of two vectors is proportional to
an area...

Uwe.

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