有一些问题,看似无法入手,若能根据其特点,用中心对称的知识来解,不仅能快速、准确地解答,而且可以获得数学美的享受.现举例说明如下: 例1 如图1,有一个矩形ABCD和⊙O,你能作一直线,把它们分成周长 There are some problems that seem to be impossible to start. If we can use the knowledge of symmetry of the center according to its characteristics, not only can we solve it quickly and accurately, but we can also enjoy the beauty of mathematics. The examples are as follows: Example 1 As shown in Figure 1, there are A rectangle ABCD and ⊙O, you can make a straight line, divide them into perimeters