圆的半径是:R=100/2/3.14=15.9235
圆的面积; S1=3.14*R*R=3.14*15.9235 *15.9235 =796.175
矩形面积;S2=15.9235 *100=1592.35
面积比;S1:S2=796.175:1592.35=1:2
圆的半径是:R=100/2/3.14=15.9235
圆的面积; S1=3.14*R*R=3.14*15.9235 *15.9235 =796.175
矩形面积;S2=15.9235 *100=1592.35
面积比;S1:S2=796.175:1592.35=1:2