Question 894054
{{{A=pi*r^2}}}
A is for area
r is for radius
d is for diameter
{{{d=2r}}}, according to definition of diameter.


You are given A and you want to find d.


{{{pi*r^2=A}}}
{{{pi*(d/2)^2=A}}}
{{{(d/2)^2=A/pi}}}
{{{d/2=sqrt(A/pi)}}}
{{{highlight(d=2*sqrt(A/pi))}}}