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对于已知两边和其中一边所对的角解斜三角形的问题,初中学生在学习中往往感到困难。其原因不外乎是,对于给定条件下的问题是否有解,若有解,有多少个?心中没底。因而常出现死背结论,乱套公式的错误。针对这种情况,我们将教学过程分为四个步骤进行。一、由学生动手作图,在实践中发现问题对于已知两边和其中一边所对的角解斜三角形的解的情况,从几何角度来说,就是由给定的条件一已知两边和其中一边所对的角,能否作出三角形,若能作出,有多少个?是什么类型的?为了使学生对可能出
For students who are known to have skewed triangles on both sides and on one side, junior high school students often find it difficult to learn. The reason for this is nothing more than whether or not there are solutions to the problems under given conditions. If there are solutions, how many are there? Therefore, there are often dead-back conclusions, and mistakes in formulating indiscriminately. In response to this situation, we divided the teaching process into four steps. First, by the students’ hands-on mapping, in practice, it is found that the problem is known to the solution of the solution to the oblique triangles on both sides and on one side. From the geometric point of view, it is given the conditions of the known side and the Can we make a triangle on the right corner, if we can make it, how many are there? What kind is it?