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圆周圆弧扇形什么概念，

2025-03-25 09:08:36

推荐回答（1个）

回答1：

圆周是圆的一周，是个闭合曲线，上面任意一点到圆心的距离都相等为半径长度。圆周只有长度，没有面积。
圆弧，是圆周上的一部分，是一条曲线，只有长度，没有面积。
扇形，是由圆弧和其两个端点对应的两条半径围成的封闭平面图形，有面积，有周长。

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