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环形面积的计算，熟练记住圆的面积公式求解不难，六年级数学
在一个半径为8m的圆形花坛的周围修一条3m宽的小路，这条小路的面积是多少平方米？
小学几何：阴影部分面积、平面几何、立体几何，解决图形难题5/49
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