A Rotating Hinged Parallelogram

speed of the counterclockwise arm

0.3

speed of the clockwise arm

1

length of parallelogram

2

rotate

0

One of the vertices of a hinged parallelogram is fixed while two of the sides joined to it rotate in opposite directions, not necessarily with the same speed. This Demonstration shows the path taken by the opposite vertex for a setting of the speeds and the length of the parallelogram.