教学目标解直角三角形的知识在测量、工程技术中有广泛的应用,本节课使学生知道测量中坡度(也叫坡比)、坡角的概念,掌握坡度与坡角之间的关系,能够运用解直角三角形的知识,解决与坡度有关的实际问题,增加学生的数学应用意识,进一步培养学生把实际问题转化为数学问题并加以解决的能力.教学重点、难点掌握坡度与坡角之间的关系,能 Teaching Objectives The knowledge of solving right-angled triangles is widely used in surveying and engineering. This lesson enables students to know the concept of slope (also called slope ratio), the concept of slope angle, grasp the relationship between slope and slope angle, Applying the knowledge of right-angled triangles to solve practical problems related to grade, increasing students ’awareness of math application and further developing students’ abilities to translate practical problems into mathematical problems and to solve them. Teaching Points, Difficulties Grasp the difference between grade and slope angle Relationship, can