一个圆形的圆盘上有两个点，圆盘均速运动，两个点均做摆线运动。已知其中一个点的半径，求另一个点的具体位置。-There is a circular disc on two points, the average rate of movement of the disc, two points are made cycloidal motion. Wherein a point of known radius, find the specific location of another point.