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在几何初步知识教学中,作为教师对作图应该有讲究,要讲究作图的先后次序,要讲究各部分的大小、成什么比例,要讲究所画的几何形体符合一定的要求。例如,画一组平行线,就应该按画平行线的方法去画,不能随手画几条线,大致平行就了事。如果教师所作的图形,圆不是圆,方不成方,该平行的不平行,该垂直的不垂直,当长不长,当短不短,当大不大,当小不小,这就会给学生得到错误的印象。
In the teaching of geometric initial knowledge, as a teacher, there should be stress on the mapping. It is necessary to pay attention to the order of drawing. It is necessary to pay attention to the proportions of the parts and the proportions of the parts. It is necessary to stress that the geometry drawn meets certain requirements. For example, if you draw a parallel line, you should draw a line drawn parallel to it. You can not draw a few lines by yourself. If the teacher made the graph, the circle is not a circle, the square is not a square, the parallel is not parallel, the vertical is not vertical, when the length is not long, when the short is not too short, when the big is not small, this will give Students get the wrong impression.