论文部分内容阅读
新课标对学生作图能力的要求明显加强,因此,探讨平面图形的直观图的性质很有必要.若记平面内的封闭图形为F,在这个平面内建立直角坐标系后,按照斜二测法(即建立45°坐标系x′o′y′)画出这个图形的直观图F′再与原图F相比较,形状有明显不同,并且由于图形在直角坐标系中的位置不
The requirement of the new curriculum standard for students’ drawing ability is obviously strengthened. Therefore, it is very necessary to discuss the nature of the intuitive drawing of the plane figure. If the closed figure in the plane is F, after establishing the rectangular coordinate system in this plane, follow the oblique two. The method of measurement (that is, the establishment of the 45° coordinate system x′o′y′) draws the intuitive map F′ of this figure and then compares it with the original figure F, the shape is obviously different, and the position of the figure in the rectangular coordinate system is not