正25边形的一个简洁且高精度做法

渔夫在今年的最后一天，忽然发现一个超级简单的正25边形的尺规作图法，精度在E-10级，如果用360度的度数表示，小数后面要跟7个0 呢。做法简单，一共两个圆，7条直线。连作法也不用写了。给有兴趣的网友参考吧。可以在假期里用来哄大孩子哦。

[蒲汇塘渔夫]

回复lhzhang666的评论:
谢谢指出错误，有些不好意思啊，两个2漏了平方了。

[lhzhang666]

谢谢分享。挺不错的游戏。哄大孩子的时候，别忘了加上一句"图中说明有2~3处错误，你能找到吗？找到后别忘了管老爸老妈请赏哦！"

[temptemp]

as matter of fact, what autocad did is exact number with no errors.
but I still admire your effort, good job.

[蒲汇塘渔夫]

yes. you can do any regular polygon as you want. but how do you know the accuracy of the auto-cad? how can you check? with this classic method, you can check if you want. But most time it is not necessary.

[temptemp]

if you use autocad, you can make any 边形 you want in less than 5 seconds.
your 25 边形 looks almost like a circle.