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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,圆的面积,圆面积=?,r,r,圆的面积相当于一个小正方形面积的三倍多一些,底,高,长,宽,长方形 面积 = ,平行四边形面积= ,长,底,宽,高,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,4,2,3,5,6,7,8,9,10,11,12,13,14,15,16,1,4,2,3,5,6,7,8,9,10,11,12,13,14,15,16,1,4,2,3,5,6,7,8,9,10,11,12,13,14,15,16,1,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,32,31,30,29,28,27,26,25,24,23,22,21,20,19,18,17,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,C2,r,宽,长,r,r,圆的面积相当于一个小正方形面积的三倍多一些, ,S =,2,r,一个圆的半径是4厘米,它的面积是多少平方厘米?,3.144,2,=50.24(平方厘米),答:它的面积是50.24平方厘米。,底=C,高=4r,
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