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1 看教材1.1 教材所处的地位及前后联系《弦切角》是九年义务教育三年制初中几何第三册第七章第二单元的内容 .本节课是在学生学习了圆的有关性质、直线与圆的位置关系基础之上开始学习的 .教材首先给出了弦切角定义、定理及证明 ,接着通过一个代表性的例题讲解弦切角定理的
1 Look at the teaching materials 1.1 The position of the teaching materials and the connection between them before and after “The String Cut Angle” is the content of the second unit of the third-year junior middle school geometry of the third-year compulsory education. This lesson is about the students’ learning about the circle. Based on the positional relationship between the nature, the straight line and the circle, we begin by learning. The textbook first gives the chord angle definition, theorem and proof, and then explains the chord angle theorem through a representative example.