Question 70497
Start with the formula for the area of a circle:
{{{A = (pi)r^2}}} Divide both sides by {{{(pi)}}}
{{{A/(pi) = r^2}}} Take the square root of both sides.
{{{sqrt(A/(pi)) = r}}} Now multiply both sides by 2 since D = 2r
{{{D = 2sqrt(A/(pi))}}}