有关多边形面积的题目具有灵活性,要解决它,一般要用到割、补、拼等技巧。例1.如图1所示,AD=10厘米,CF=12厘米,求图中长方形的BDEF的面积是多少平方厘米?分析与解:在原图上添加一个完全一样的图形,组合成一个长方形,如图2。根据长方形的对角线把长方形分成面积相等的两部分,则有:三角形ABC The subject of polygons area has the flexibility to solve it, generally use the skills of cut, fill, fight and so on. Example 1. As shown in Figure 1, AD = 10 cm, CF = 12 cm, find the area of ​​a rectangular BDEF is the number of square centimeter? Analysis and Solution: Add an identical graphic in the original picture, combined into a rectangle , As shown in Figure 2. According to the diagonal of the rectangle rectangular divided into two equal areas, there are: triangle ABC