Question 742900
Divide the perimeter by 3 to get the measure of each side of equilateral triangle.
s = 12/3 = 4 cm.
The area of any equilateral triangle with side s is equal to {{{s^2(sqrt(3))/4}}}.
{{{A = s^2(sqrt(3))/4}}}
{{{A = 4^2(sqrt(3))/4}}}
{{{A = highlight(4sqrt(3))}}} sq cm