substitute equation 2 and equation 4 in equation 1 x+[14x/25]+[12x/25]=170------> multiply by 25 both sides 25x+14x+12x=4250 51x=4250 x=4250/51 x=250/3 y=14x/25------> y=(250/3)*(14/25)----> y=140/3 z=12y/14-----> (140/3)*12/14----> z=40
Using Heron's formula, Area of the triangle = √s (s-a) (s-b) (s-c) where s is the semiperimeter s=170/2-----> s=85 ft Area=√85*[85-250/3]*[85-140/3]*[85-40] Area=9.22*[1.67]*[38.33]*[45]------> Area=26558.21 ft²