Question 777709
Solve for d in {{{A=pi(d/2)^2}}}.


Multiply both members by {{{pi^-1.}}}
{{{A/pi=(d/2)^2}}}

Raise both members to (1/2) power.
{{{sqrt(A/pi)=d/2}}}


Multiply both members by 2.
{{{highlight(2*sqrt(A/pi))=d}}}


The square root of the already-irrational pi, could use further simplification from being in a denominator position:

{{{d=2*sqrt(A/pi)sqrt(pi/pi)=2*sqrt(A*pi)/pi=highlight((2/pi)sqrt(A*pi))}}}
Not certain if this is really simpler or not.