Dynamics - Instantaneous Center of Zero Velocity example 3

Thermodynamics: drive.google.com/file/d/1bFzQ...
Mechanics of Materials: drive.google.com/file/d/1P-pc...
Statics: drive.google.com/file/d/1aYY5...
Dynamics: drive.google.com/file/d/1_JTk...

[@zDoubleE23]

seems like every example i see of the IC side is a 45 degree angle

[@hassankhalil9184]

I think a trickyway for me to look at how to find the angles of the triangle of the IC is i take the whole triangle composed of Rc Rb and Ac and then find out my lengths from there,