按照“发现法”精神,现就“创设问题,诱发学习动机;引导学生发现;运用所发现的知识于实践”等三个方面,谈谈教学“三角形内角和”的一些设想。在创设问题,诱发学习动机方面,一种方法是,可先让学生观察大小不同、形状各异的三角形,并在黑板上写上∠1+ In accordance with the spirit of the Law of Discovery, we are going to talk about some tentative ideas on teaching “the angle and angle of the triangle” in terms of “creating problems, inducing learning motivation; guiding students to find out; using found knowledge in practice”. One way to create problems and motivate learning motivation is to allow students to observe triangles of different sizes and shapes and write ∠1 +