圆是一种几何图形,指的是平面中到一个定点距离为定值的所有点的集合。这个定点叫做圆的圆心,一般用字母“o”表示;连接圆心和圆周上任意一点之间的连线叫做半径,用字母“r”表示;通过圆心并且两个端点都在圆周上[详细]
圆的周长:c=2 r= d。 圆的周长开发者_运维技巧=直径:c=d是多少? 圆的周长=2半径:c=2r[详细]
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