Centre of Gravity and Stability(Animation Option)

Topic:
Angles

How do you describe the angle of tilt in the diagram above, with reference to the centre of gravity CG, the pivot and the vertical line through the centre of gravity?

At neutral equilibrium (precariously balanced, where the the rectangular object will neither topple or go back to original position), how is the angle of tilt related to the width and the height of the object?