The length of the side of an equilateral triangle that is circumscribed by a circle with radius r is s = r sqrt(3)so s = (6) sqrt(3)then the formula for the area of an equilateral triangle isA = sqrt(3) (s^2) / 4 substitute the value of s in the equationA = sqrt(3) ( (6) sqrt(3))^2 /4A = 46.77 sq in
