“斜三角形的解決”是平面三角的重要內容之一,这是因为它不仅有較大的实用价值,而且在理論上也有其重大的作用。因此,提高“斜三角形的解法”这一章的教学貭量,就成为提高三角教學貭量的一个重要方面。現在,把我們关于“斜三角形的解法”教学的几点体会写出来,不对之处,请大家指教。一、教学“斜三角形的解法”应达到的目的要求根据我們几年来的教学体会,我們认为本章的教学目的要求应該是: 1.使学生在三角函数的性貭和解直角三角形的基础上明确斜三角形解法的四种情形,并使学生牢固地掌握正弦定理、余弦定理及正切定理等关系式,从而了解斜三角形各元素间的相互关系。 2.使学生能根据以上各关系式,利用“四位数学 “The solution of the oblique triangle” is one of the important contents of the plane triangle. This is because it not only has great practical value, but also has a major role in theory. Therefore, improving the teaching volume of the chapter “solution to oblique triangles” has become an important aspect of improving the quantity of triangular teaching. Now, let’s write out some of our experiences on the teaching of the “angled triangle solution”. First, the purpose of the teaching “oblique triangle solution” should be achieved According to our teaching experience over the past few years, we believe that the purpose of this chapter’s teaching should be: 1. Make students clear on the basis of the trigonometric function of the solution and the right triangle The oblique triangle solves four kinds of situations, and enables students to firmly grasp the relationship between the sine theorem, the cosine theorem, and the tangent theorem, so as to understand the relationship between the elements of the oblique triangle. 2. Enable students to use “four mathematics” based on the above relationships