解直角三角形问题是各地中考必考内容，复习时一要注意弄明白一些重要的概念，比如俯角、仰角、坡比、坡度、偏多少度等，再者要能理解图形和准确画出图形．本文以近两年的中考题为例说明．例１如图１，A市气象台预报，一股强沙尘暴中心在A市正西方向１０００km的B处，正迅速向 Solving the right angle triangle is a must-read content for all local exams. When reviewing, it is necessary to pay attention to understanding important concepts such as depression angle, elevation angle, slope ratio, gradient, and how many degrees, etc. Furthermore, we must be able to understand the graph and accurately draw the graph. This article takes the exams in recent two years as an example. Example 1 As shown in Fig. 1, the weather forecast of City A is forecasted. A strong sandstorm center is located at B, 1000km west of City A, and is rapidly moving toward