球的截面的性质用一个平面去截球截面是圆面球心和截面圆的距离d与球的半径r及截面圆半径r之间的关系是r=提醒球与球面的区别球不仅包括 Template




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tomski球的截面的性质用一个平面去截球截面是圆面球心和截面圆的距离d与球的半径r及截面圆半径r之间的关系是r=提醒球与球面的区别球不仅包括 coloring