nicer formula
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@ -592,7 +592,7 @@ half-circle's diameter and adjusted size. These easily derive from circle's
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area formula $A = 2\pi r^2$. Diameter:
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\[
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D = 2\sqrt{2 adjsize / \pi}
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D = 2\sqrt{\frac{2 adjsize}{\pi}}
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\]
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In reverse, half-circle's area from it's diameter (adjusted size):
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