共边三角形应用广泛,中考试题中某些相关问题,看似疑难重重,无从入手,利用共边三角形的性质,可简化思维,避免失误,轻松求解.一、构造共边直角三角形,判断街道改造是否违反规定例1(2012桂林中考题)某市正在进行商业街改造.如图1,商业街起点在古民居P的南偏西60°方向上的A处,现已改造至古民 The common edge triangle is widely used. Some problems in the middle-test questions seem to be difficult and difficult to start. Using the nature of a common-edged triangle can simplify thinking and avoid mistakes. It is easy to solve. First, construct a right-angled right-angled triangle and judge street reconstruction. Whether or not there is a violation of Regulation 1 (2012 Guilin exam) A city is undergoing a commercial street transformation. As shown in Figure 1, the commercial street begins at the A point on the west-south of the ancient residence P, which has been transformed to the ancient people.