尺规作图是初中几何的重要内容之一,用没有刻度的直尺和圆规能作出很多图形,也可以作已知线段的中垂线,还可以平分已知角……但这看似功能强大的直尺和圆规对有些问题却无可奈何,其中就有3个看似很简单的问题,但用直尺和圆规就是作不出来,这3个问题被称为几何作图中的“三大作图不能问题”。 Ruler drawing is one of the important contents of junior high school geometry. Many rulers can be made with rulers and compasses without scales. It can also be used as a perpendicular line to a known line segment. It can evenly divide the known angle... but this looks like a function. Strong rulers and compasses are helpless to some problems. There are three seemingly simple problems, but they cannot be achieved with rulers and compasses. These three problems are called the three major works of geometric drawing. Figure cannot be a problem."