“空间中最完美的几何图形是球,而平面内最完美的几何图形是圆”———笛卡儿.圆是平面内到定点的距离等于定长的所有点组成的曲线,我们的身边到处是车轮滚滚,车轮利用了圆的这一性质,由于它等长的车辐,使车轴始终处于一定的高度,从而得到一个平稳的水平运动.但是,你有没有想过 “The most perfect geometry in space is the ball, and the most perfect geometry in the plane is the circle” - Descartes. The circle is the curve of all points in the plane to the fixed point distance equal to the fixed length, our side Everywhere there is a rolling wheel, and the wheels take advantage of the round nature. Due to its lengthy spokes, the axle is always at a certain height, which results in a smooth horizontal movement. However, have you ever wondered?