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三角形的内角和是三角形的一个重要性质,它有助于学生理解三角形的内角之间的联系,也是今后进一步学习数学的基础。教学这一课,我设计了以下四个教学环节,努力在引发疑问、激发兴趣、启迪思维上花力气,做文章,取得了理想的教学效果。 1.指导辨形,引出问题 新课开始,我先从一本书里抽出一个三角形(只露出一个直角),问:这是什么三角形?同学们纷纷举手,争先恐后地回答:直角三角形。再抽出一看,果然不错。接着抽出一个三角形(只露出一个钝角),
The interior angle of the triangle is an important property of the triangle. It helps students to understand the relationship between the interior angles of the triangle and is the basis for further study of mathematics in the future. Teaching this lesson, I designed the following four teaching links, trying to provoke questions, stimulate interest, inspire thinking on strength, make an essay, and achieved the ideal teaching effect. 1. Guided discrimination, leads to the problem The beginning of the new lesson, I first pulled out a triangle from a book (only revealing a right angle), asked: What is the triangle? Students have raised their hands, scrambling to answer: right triangle. Then take a look, it really good. Then draw a triangle (exposing only an obtuse angle),