Oddly enough, Paul, we agree on something. It's NOT 'directly proportional'..... and that's why I did NOT say it was.... I was careful to say 'directly LINKED'....
If you want honesty from me... it was late, I was kn***ered and I couldn't remember the calculation when using diameter as opposed to radius. I should have said 'proportional to' (pi*d^2)/4.
Had I tried to write that on Sunday night, I would have (incorrectly) written (pi*d^2)/2 as I knew radius was d/2.... But, I suspected something was wrong but could not remember WHY it was wrong..... so I didn't write it! Hence the careful use of the words 'directly LINKED...'...
Ian
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