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For a triangle ABC what this code does is;
N = ABxAC + BCxBA + CAxCB  removing all the terms that cancels itself.

Yes, thanks! I kind of knew that formula, which you might have guessed from the fact that I just implemented it.

Oh, I just noticed that you were responding to bagginsbill, not me. Never mind, then!

-- I'm not mad at you, just Westphalian.