S正方形ABCD=4(R^2),
S矩形HCFG=S矩形OEFG-正方形OECH=π(R^2)-(R^2)=(R^2)(π-1)
∴S正方形ABCD/S矩形HCFG=4(R^2)/(R^2)(π-1)=4/π-1=4/2.14=200/107