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在解几何题时,适当地构造三角形或四边形,有时能取得很好的效果,我们不妨把这种方法称为“构形法.”下面举例说明,供同学们参考: 一、求多角和例1 求下列图形中(如图1),∠A+∠B+∠C十∠D+∠E
When solving a geometric problem, constructing a triangle or a quadrilateral appropriately can sometimes achieve good results. We may call this method “formation method.” The following examples are provided for students’ reference: 1. To find multiple corners and cases 1 Find the following graph (Figure 1): ∠A+∠B+∠C∠ D+∠E