度量单位
如何描述或表示角的大小
- 弧度制
- 角度值
圆
直径:
通过圆心且两个端点都在圆上任意一点的线段
半径:
从其中心到其周边的任何线段
圆心:
圆心是圆的中心,即到圆的边缘距离都相等且与圆在同一个平面的点
周长: 2Πr即:2*3.1415962~*半径,因直径=2*半径 长度也表示为ΠD,Π*直径
弧度制
符号:R 或rad
描述:以弧的长度来描述或表示角的大小。
定义:1R = 长度等于半径的弧
换算:1度=π/180≈0.01745弧度
大小:1圆=2Π弧度
角度制
符号:°
换算:1弧度=180/π≈57.3度
大小:1圆=360度
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