Mechanism for drawing circle 11

Input: pink C-shaped crank.
The mechanism has no dead positions.
Lengths of the links:
Pink: a + a
Green and base: b + b, such that b is greater than a
Yellow: c, such that c is greater than b
Orange and blue: sqrt(a*a - b*b + c*c)
The end point of the green bar traces a circle of virtual center C, 2a radius.
This video was made at the suggestion of Prof. Aristides Gogousis, Greece, based on the video:
https://youtu.be/Vx_qMpJ-ClQ

STEP files of this video:
https://www.mediafire.com/file/6cg5tuorhx0oho4/MechanismDrawingCircle11STEP.zip/file
Inventor files of this video:
https://www.mediafire.com/file/7pozom93ycj9s4c/MechanismDrawingCircle11Inv.zip/file

Видео Mechanism for drawing circle 11 канала thang010146