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教材浙义教初中数学第三册ξ9.17直角三角形的性质(二) 课案本节课题是针对我校初二学生进行设计的,主要理论依据是“问题性教学理论”,下面分五个方面谈谈自己的的一些想法.1 教材的地位和作用 本节课主要研究的是直角三角形的一个性质定理(30°角所对的直角边等于斜边的一半)及其逆定理的证明和定理的一些简单的应用,其作用和地位主要体现在以下两个方面: (1)它的应用广泛,是后续学习的必备基础知识。例如锐角三角函数就是以此为基础的,并且是解决有关几何论证及计算问题的重要依据,具有广
The teaching material of the junior high school mathematics of the Zheyi teaches the nature of the 9.17 right-angled triangle (2) The lesson in this section is designed for the students of the 2nd grade in our school. The main theoretical basis is the “problem teaching theory”. Aspects to talk about some of their own ideas. 1 The position and role of teaching materials This section mainly studies a property theorem of a right-angled triangle (half-angled pair of 30° is equal to half of the hypotenuse) and the proof of its inverse theorem. The simple application of the theorem, its role and status is mainly reflected in the following two aspects: (1) It is widely used, it is the necessary basic knowledge for follow-up study. For example, an acute angle trigonometric function is based on this, and is an important basis for solving geometrical argumentation and calculation problems.