"Porpoise" <porpoise1954 at yahoo.co.uk> wrote in message news:dne432$vbf$1 at news.spamcop.net... > No, no. It's not S x S x D x D (S squared x D squared) > It's S + S, D + D (2 x S, 2 x D) = 2S, 2D Arrrghghhhh :-\
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