小明自从知道了仅用直尺和圆规也可以作出许多美丽的图形后，执意要拜几何博士欢欢为师学作图．这不，小明特地从商店购买了直尺和圆规，一大早就来到了欢欢家欢欢博士见小明言辞恳切，深受感动，决心倾其所学，教小明学会尺规作图．欢欢博士首先讲J尺规作图的概念，他说：“尺 After knowing that only a ruler and compasses can be used to make many beautiful graphics, Xiao Ming insisted on painting the Dr. Huan Huan for the teacher’s education. This is no. Xiao Ming specially purchased rulers and compasses from the store. He came to Huanhuan family early in the morning and Huan Huanhuan met Dr. Xiao Ming with sincere words. He was deeply touched and determined to learn what he had learned and to teach Xiao Ming how to use rules and regulations. Dr. Huan Huan first talked about the concept of J rule gauge drawing. He said: