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角是平面几何中最基本的概念之一.它是我们今后学习三角形、多边形和圆的基础,为了帮助同学们正确理解角的相关概念。现剖析如下: 1.角的定义有公共端点的两条射线所组成的图形叫做角.公共端点叫做角的顶点,两条射线叫做角的边.由角的定义知.角有两个要素:一个顶点.两条边.缺一不可. 角也可以看成是由一条射线绕着它的端点旋转而成的图形.如图1.射线的端点叫角的顶点.起始位置的射线(OA)叫角的始边,终止位置的射线(OB)叫角的终边.
The corner is one of the most basic concepts in plane geometry. It is the foundation for us to learn triangles, polygons and circles in the future, in order to help students understand the concepts related to corners correctly. The analysis is as follows: 1. The definition of the angle is composed of two rays of the common endpoints called the corner. The common endpoint is called the vertex of the corner, and the two rays are called the edge of the corner. Known by the definition of the angle. The angle has two elements: A vertex. Two sides. Indispensable. The corner can also be seen as a figure that is rotated by a ray around its end point. Figure 1. The end of the ray is called the vertex of the corner. The ray in the starting position (OA ) Calling the beginning of the corner, the end of the beam (OB) called the end of the corner.