Consider the mechanism shown below, at this instant the angular position of link $AD$ is

$=30$ and its angular velocity is $=2ra\frac{d}{secCW}.$ Find the velocity of point $C$ and the value

of $r$ at this instant using:

a$)$ Loop closure equations formulations.

b$)$ Instant velocity centers.

At this position $r=304mm.$ The constant parameters are $=52,h=650mm$ and $b=700mm.$