Any even notice the first derivative of Area with respect to the radius is the circumference?
A = pi R^2
DA = 2 pi R DR
c = 2 pi R
That not as pretty if using Tau.
SpikedMath wrote:This actually still works with tau.
[tex]A=\frac{1}{2}\tau r^2[/tex]
[tex]\frac{dA}{dr}=\tau r[/tex]
and the Circumference is [tex]C=\tau r[/tex]
It should work regardless of which circle constant is used
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