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这是个活动的几何模型,是在领导上鼓励支持和同志们的热心帮助以及我两年来制作和使用直观教具的基础上制作出来的. 当我开始制作这个模型时,只想制个活动四边形借以说明平行四边形、矩形、菱形、正方形及梯形的定义.但在试制的过程中,经过不断的鑽研与改进,在最后确定的形状可以变换63种图形,说明49个问题. 这个模型制作时只需两个“六折尺”和四个“螺旋钉”.同时,制作过程也比较简单,两小时左右就可以作成.它可以代替29件模型的作用.使用后像折尺似的把它折在一起,装在一个盒里,收拾也很方便,它的优点是“制作容易,成本低廉,使用灵活,收拾方便”.
This is a geometric model of activity. It is based on leadership encouragement and support from comrades, and I made and used visual aids for two years. When I started to make this model, I only wanted to make a living quadrangle. Explains the definition of parallelograms, rectangles, diamonds, squares, and trapezoids. However, in the course of trial production, after continuous research and improvement, 63 shapes can be transformed in the final shape, explaining 49 problems. Two “six-foot rulers” and four “spiral nails”. At the same time, the production process is relatively simple, and it can be created in about two hours. It can replace the role of 29 models. After use, it is folded like a ruler. Together, packed in a box, it is also very convenient to clean up, its advantages are “easy to make, low cost, flexible use, easy to clean up.”