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《三角形内角和》是一节典型的新授课,有很多成熟的教学案例。笔者使用的是浙教版小学数学教材,为了体现新思维教材新颖独特、思路开阔、维度多元的特征,笔者进行了不同的环节设计,并付诸实施。一、根据学生实际能力,创设情境【案例1】师:今天老师带来了三个三角形,认识它们吗?(出示直角三角形、钝角三角形、锐角三角形)它们都有三个角,我们把这三个角称作三角形的内角。师:这些三角形本来是好朋友,可今天它们却吵了起来,请同学们来评评理。课件播放:直角三角形(边较长,面积
“Triangular triangle and” is a typical new lectures, there are many mature teaching cases. The author uses the Zhejiao version of primary school mathematics textbooks, in order to reflect the new thinking of new and unique textbooks, open-minded, multi-dimensional features, the author conducted a different part of the design, and put it into effect. First, according to the actual ability of students to create situations 【Case 1】 Teacher: Today, the teacher brought three triangles, know them? (Show right triangle, obtuse triangle, acute triangle) They have three corners, we put these three The corners are called the interior angles of the triangle. Teacher: These triangles would have been good friends, but today they are noisy, ask the students to comment. Courseware Play: Right triangle (long side, area