Question 600363
The formula for the area of an equilateral triangle is 



{{{A = (s^2*sqrt(3))/4}}}



where 's' is the length of the side of the equilateral triangle.



You can solve for 's' to get 



{{{A = (s^2*sqrt(3))/4}}}



{{{4A = s^2*sqrt(3)}}}



{{{4A/sqrt(3) = s^2}}}



{{{(4A*sqrt(3))/3 = s^2}}}



{{{s^2 = (4A*sqrt(3))/3}}}



{{{s = sqrt((4A*sqrt(3))/3)}}}



Let me know if this helps. Thanks.