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学习相似三角形的过程中,发现学生对两个三角形相似的不同描述总是存在理解的误区,从而导致丢解现象.因此正确理解两个相似三角形的不同描述,是利用相似三角形的性质正确解决数学问题的关键.一般常见的对两个三角形相似的描述主要有如下几种情况.一、描述的两个相似三角形形状是确定的,且各边的对应关系是确定的;这时只有唯一解;学生不易出错.常见描述如下:(1)直接使用相似符号“∽”描述两个三角
During the process of learning similar triangles, we find that there are always misunderstandings in students’ different descriptions of the two triangles, which leads to the phenomenon of discarding.Therefore, to correctly understand the different descriptions of two similar triangles is to use the properties of similar triangles to solve math The crux of the problem is that the two most common triangles are described as follows: First, the shape of two similar triangles described is definite and the corresponding relationship between the sides is definite; then there is only one solution; Students are not prone to error. Common description is as follows: (1) directly use the similar symbol “∽ ” describes two triangles