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本章主要内容是解三角形。我们知道,一个三角形,或是直角三角形,或是斜三角形,它们都包括三条边和三个角等六个元素。所谓解三角形,就是由三角形中已知的边和角,来计算得出未知的边和角。怎样由三角形中已知的边和角,来计算得出未知的边和角呢?就解直角三角形来说,主要是明确三角形中边与角的关系,这在前两章已经学习过了,重要的是,要记住这些关系式。解斜三角形,还要学习并掌握正弦定理和余弦定理,并能熟练地运用这些定理。此外,还要理解、掌握并能熟练地
The main content of this chapter is to solve triangles. We know that a triangle, either a right-angled triangle or an oblique triangle, includes six elements such as three sides and three corners. The so-called solution to the triangle is to calculate the unknown edges and corners from the known edges and corners of the triangle. How to calculate the unknown edges and angles from the known edges and corners of the triangle? For solving a right-angled triangle, it is mainly to clarify the relationship between the edge and the angle of the triangle, which has been studied in the previous two chapters. It is important to remember these relationships. To solve the oblique triangles, we must also learn and master the sine and cosine theorems, and we can use these theorems skillfully. In addition, we must understand, master, and skillfully