Length, diameter and radius - from area

A =		Qm²Rm²Ym²Zm²Em²Pm²Tm²Gm²Mm²km²     ham²     yd²     ft²dm²     inch²cm²mm²     kcmil     cmilμm²nm²pm²fm²am²zm²ym²rm²qm²	Area☺ ← a,b,d,r
engineeringpractical ☺ exact6 digits5 digits4 digits3 digits2 digitsinteger ☺
a =			Edge of square☺ $A=\sqrt{A}$
d =			Diameter $d=2\cdot \sqrt{{\displaystyle \frac{A}{\pi }}}$
r =			Radius $r=\sqrt{{\displaystyle \frac{A}{\pi }}}$
○ =			Wire gauge☺ $AWG=36-39\cdot {\log }_{92}\left({\displaystyle \frac{d}{127\cdot {10}^{-6}\text{ m}}}\right)$