老师上数学课有时要画圆,有时还要知道圆的半径。我们可制作一个新颖的吸附式带卷尺的圆规,不但上述问题解决了,还可以画比一般两脚圆规更大的圆,甚至可用它量长度,并且使用携带都十分方便。下面我们动手制作吧! Teachers sometimes need to draw math lessons in math class and sometimes know the radius of the circle. We can create a novel adsorption compasses with tape measure, not only solve the above problems, you can draw larger circles than the average two-foot compass, and even the length can be used, and the use of carrying are very convenient. Here we make it!