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求组合图形面积时,我们可以采用以下几种基本方法。(一)平移法。把一个图形的位置作平行移动,使它与其它图形合并,拼成一个简单的图形, 这种解题方法叫平移法。例:计算图中阴影部份的面积。(单位:厘米)将 S_1向右平行移动2厘米,S_1和 S_2就可合并成一个正方形(如右下图)于是得到:
When seeking to combine the graphic area, we can use the following basic methods. (A) translation method. Move the position of a graph in parallel and merge it with other graphs to create a simple graph. This method of solving problems is called panning. Example: Calculate the area of shaded area in the figure. (In centimeters) Move S_1 parallel to the right by 2 cm. S_1 and S_2 can be merged into a square (as shown in the bottom right). Then you get: