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三角形内角和是180°,从中学起,我就学习过这个知识,用有关平行的性质对这一结论进行证明,算起来已经过去近20年了,仿佛从没有对这个问题深入思考过。上学时把它当成一个概念,当成一个证明题来做,当老师后则当成了一节课。一、教的过程在上一轮教学这个内容时,我对这一教学内容做了如下研究:一是“三角形内角和是180°”在欧式几何中成立,非欧几何中三角形内角和不等于180°。让学生了解每一个问题都要在一定前提下展开讨论。二
It has been almost 20 years since I learned the intermediate angle of the triangle and learned from the middle school that this knowledge has been learned from the parallel nature and has never been pondered over this issue. When you go to school as a concept, as a proof to do, when the teacher is treated as a class. First, the teaching process In the previous round of teaching this content, I made the following teaching content: First, the “triangle angle and is 180 °” was established in European geometry, non-Euclidean triangular interior angle and Not equal to 180 °. Let students understand each issue must be discussed under certain conditions. two