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“多边形及其内角和”的学习,无疑是建立在三角形的内角和及四边形的内角和的认识基础之上的。学习此课,大多数教师常习惯于经由一个三角形,引出两个三角形,最后引出多边形的内角和。问题是,从三角形的内角和到四边形的内角和至多边形的内角和的环环相扣中,学生是否真正体会到转化思想在几何中的运用,是否真正厘清从特殊到一般的认识问题的方法?尤其是,学生是否真正掌握到从不同角度
The learning of polygons and their internal angles and angles is undoubtedly based on the knowledge of the internal angles of triangles and the internal angles of the quadrilaterals. To learn this lesson, most teachers are accustomed to passing through a triangle, leading to two triangles, leading to the polygons’ interior angles and angles. The question is whether students really appreciate the use of transformational thought in geometry and whether they really clarify the way from the special to the general cognitive problems, from the internal angle of the triangle to the internal angle of the quadrilateral and the internal angle to the polygon. In particular, students really grasp from different angles