Question 246810
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In order to calculate the diameter of your circle, you have to know what your quantity represents.  Is it the area (*[tex \Large A]) or is it the circumference (*[tex \Large C])?


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ D\ =\ 2r\ =\ 2\left(\sqrt{\frac{A}{\pi}}\right)]


or


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ D\ =\ \frac{C}{\pi}] 


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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