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本章在已研究了直角三角形中三边之间关系、两个锐角之间关系的基础上,进一步研究其边角之间的关系,主要内容包括正弦、余弦和正切等锐角三角函数的概念以及运用锐角三角函数等知识解直角三角形等。本章内容与相似三角形、全等三角形、勾股定理等内容联系紧密,相似三角形的性质是建立锐角三角函数概念的基础和关键,三角形全等的判定定理是解直角三角形的理论依据,解直角三角形时需要综合运用锐角三角函数、勾股定理等知识。通过本章的学
After studying the relationship among the three sides and the relationship between the two acute angles in the right triangle, this chapter further studies the relationship between the corners. The main contents include the concepts of the trigonometric functions such as sine, cosine and tangent, Trigonometric trigonometric functions such as knowledge of right-angle triangle and so on. The content of this chapter is closely related to similar triangles, congruent triangles and Pythagorean theorems. The nature of similar triangles is the basis and key to establishing the concept of trigonometric trigonometrical functions. The judgment theorem of triangle congruency is the theoretical basis for solving right-angled triangles. When the need to comprehensive use of trigonometric trigonometry, Pythagorean theorem and other knowledge. Through the study of this chapter