This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Circle line pole curve nt. en Animation showing the mechanical system of bar which is connected on one side to straight line and on the other side to circle In the middle of bar point is attached and its trajectory shown with dashed line Created by en User pmidden en User pmidden Quartic curves Animations of curves