平移与翻折是计算组合图形面积时经常用到的方法。虽然这两种方法都需要“动”组合图形中的某一部分,但是“动”的方法各有不同,同学们千万不要混淆。平移是将图形的某一部分沿一定方向平行移动,构成新的简单图形。如下图:用平行移动的方法,把左边的平行四边形转化成右边的长方形,这两个图形的面积相等,长方形的长和高分别等于平行四边形的底和高,因为长方形的面积 Pan and fold are frequently used methods for calculating the area of ​​a combined graphic. Although both methods require some part of the “move” combo, the “move” method is different and students should not be confused. Panning is to move a part of a graph in parallel in a certain direction to form a new simple graph. As shown in the figure below: The parallelogram on the left is converted into the rectangle on the right by the method of parallel movement. The areas of these two figures are equal. The length and height of the rectangle are equal to the bottom and the height of the parallelogram, respectively. Because the area of ​​the rectangle