一、教学内容本节课引入正弦定理内容时,让学生从已有的几何知识出发,提出探究性问题“在任意三角形中有大边对大角,小边对小角”的边角关系,我们是否能得到这个边、角的关系准确量化的表示呢?“这样,从联系的观点,从新的角度看过去的问题,使学生对于过去的知识有了新的认识,同时使新知识建立在已有知识的坚实基础上,形成良好的知 First, the teaching content This lesson introduces the sine law content, allowing students to start from the existing knowledge of geometry, to explore the question ”in any triangle in the big edge of the large angle, small edge of the small angle Can we get an accurate quantitative representation of the relationship between this side and the corner? "From the point of contact, from a new point of view, the problems of the past make students have a new understanding of past knowledge and at the same time make new knowledge On the solid foundation of existing knowledge, form a good knowledge