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噴水池的半徑=10/2=5米、 噴水池加上小路的半徑=5+12=17米、 小路的面積、 =噴水池加上小路的面積-噴水池的面積、 =3.14*17*17-3.14*5*5、 =3.14*(289-25)、 =3.14*264、 =828.96平方米
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