大圆半径为R,小圆半径为r2R*3.14 :2r*3.14=R:r =3:2即R/r=3/2(R*R*3.14-r*r*3.14)/r*r*3.14) *100%=[(R*R)/(r*r)-1]*100%=[(3/2)(3/2)-1]*100%=5/4 *100%=125%大圆的面积比小圆的面积多125%