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一、案例背景“三角形的内角和是180°”是三角形的一个重要性质,也是“空间与图形”领域的重要内容之一。学好它有助于理解三角形内角之间的关系,同时也是进一步学习几何的基础。在学习本课之前,学生已经掌握了角的分类、度量及三角形的认识和分类。这些都为进一步研究三角形的内角和做了知识储备和心理准备。笔者在教学设计时,结合当前课改的要求,真实地从学生已有的知识经验出发,围绕教学目标,力图让每
First, the background of the case “the angle of the triangle and is 180 ” is an important property of the triangle, but also “space and graphics ” one of the important areas. Learning it helps to understand the relationship between the internal angles of the triangle, but also the basis for further learning geometry. Before studying this lesson, students have mastered the classification, measurement, and triangulation of triangles. These are for the further study of the inner corner of the triangle and made a knowledge reserve and psychological preparation. The author in the teaching design, combined with the requirements of the current curriculum reform, the true knowledge of students from the existing experience, around the teaching objectives, trying every