大圆半径为R,小圆半径为r
2R*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%
大圆半径为R,小圆半径为r
2R*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%