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用直尺画正五边形的近似图形今年3月,我在顺义县城关公社的一个生产大队中参加为社员盖房的劳动。在休息的时候,有一位木匠师傅问我:“你知道公园中的五角亭是怎样盖起来的吗?”我不知道,虚心向他求教。他说,盖五角亭传下来有两句口诀,“一六中间坐,二八分二旁”,按着口诀就能够用直尺作出一个五角形,然后在上面立柱……。他的这番话引起了我很大的兴趣,仔细一想感到这是作近似于正五边形图形的非常简捷而优秀的方法。所谓“一六中间坐”,就是取一
An approximate graph of a regular pentagon was drawn with a straight ruler. In March of this year, I participated in the production of a house for the members in a production brigade of the Chengguan Commune of Shunyi County. During the break, a carpenter asked me, “Do you know how the five-corner pavilion in the park is covered up?” I don’t know, I asked him humbly. He said that there were two sentences in the cover of the Pentagon Pavilion. “Sitting in the middle of six and twenty-eight, two sides and two sides,” according to the mouth, he could use a ruler to make a pentagon, and then erect the pillar on it.... His remarks have aroused my great interest, and I think carefully that this is a very simple and excellent method that approximates the shape of a regular pentagon. The so-called “six in the middle” is to take one