S=(7+1.5)²π-49π=23.25π≈73.042πr=50.24 得r=8S=πr²=200.96菊花:200.96*(3/8)=75.36茶花:200.96*(5/8)=125.62πr=18.84 得r=3S=πr²=28..26S大=3S=3*28.26=84.78