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航海与测量问题是用以考查同学们解决实际问题能力的中考热点题,是解直角三角形的实际应用。此类题列式和求解过程一般比较简单。关键是理解应用性试题所描述的实际含义,掌握已测与所求之间的关系,要能根据题意正确画图或识图。还要弄清航海问题中的方向角概念,掌握测量问题中的仰角、俯角、视角等术语的意义。
The navigation and measurement problems are the hot topics for the examination of students’ ability to solve practical problems, and they are the practical application of solving the right-angle triangle. This type of statement and the solution process are generally relatively simple. The key is to understand the actual meaning described in the application of the test, to master the relationship between the measured and the request, to be able to correctly draw or read the image according to the question. It is also necessary to clarify the concept of the direction angle in the navigation problem and grasp the significance of terms such as elevation angle, depression angle, and angle of view in the measurement problem.