Splitting up a Square
Source: 2014 AIME I Problem #13
March 14, 2014
geometryAsymptotetrigonometryanalytic geometrytrapezoid2014 AIME IAIME
Problem Statement
On square points and lie on sides and respectively, so that and Segments and intersect at a point and the areas of the quadrilaterals and are in the ratio Find the area of square .
[asy]
size(200);
defaultpen(linewidth(0.8)+fontsize(10.6));
pair A = (0,sqrt(850));
pair B = (0,0);
pair C = (sqrt(850),0);
pair D = (sqrt(850),sqrt(850));
draw(A--B--C--D--cycle);
dotfactor = 3;
dot("",A,dir(135));
dot("",B,dir(215));
dot("",C,dir(305));
dot("",D,dir(45));
pair H = ((2sqrt(850)-sqrt(120))/6,sqrt(850));
pair F = ((2sqrt(850)+sqrt(306)+7)/6,0);
dot("",H,dir(90));
dot("",F,dir(270));
draw(H--F);
pair E = (0,(sqrt(850)-6)/2);
pair G = (sqrt(850),(sqrt(850)+sqrt(100))/2);
dot("",E,dir(180));
dot("",G,dir(0));
draw(E--G);
pair P = extension(H,F,E,G);
dot("",P,dir(60));
label("", (H+E)/2,fontsize(15));
label("", (E+F)/2,fontsize(15));
label("", (G+F)/2,fontsize(15));
label("", (H+G)/2,fontsize(15));
label("",(sqrt(850)/2,-4.5),fontsize(11));
[/asy]