By: Nobody/Anonymous  nobody 
Hi, 
By: Martin Baker  martinbaker 
I don't know the answer to this, if anyone knows
the answer I would be interested, so that I can put it on the web
pages. 
By: Nobody/Anonymous  nobody 
Firstly you need to find the normal, of course
there isnt a specific normal but we can assume a length of 1 it
doesnt matter. 
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