关于圆周五等分和正五边形的作图方法,在《机械制图》教材中都是采用传统的近似的画法,存在着作图步骤较多、容易产生作图误差等不足。本人运用几何作图知识得出了一种更为简便的圆的五等分近似画法,其作图精度和误差都在允许范围之内,并在实际的教学中收到了良好的教学效果。 As for the method of drawing the equinoxes and regular pentagons of the circle, the traditional approximate painting method is adopted in the “mechanical drawing” teaching materials, and there are many steps such as drawing steps and easy to produce the drawing errors. I use the knowledge of geometric mapping to draw a more convenient round of five-fifths approximation drawing method, the accuracy and error of the drawing are within the allowable range, and received good teaching results in the actual teaching.