Rod in equilibrium, and find its angle to the vertical plane

[jmao15]

Homework Statement

The diagram shows a uniform rod AB resting in the angle between a vertical plane and a plane inclined at 60° to the vertical. Find the angle theta if: (a) both planes are smooth, (b) the inclined plane is smooth but the vertical plane is rough, A is on the point of slipping down and μ =0.5

Relevant Equations

Lami's theorem??

Literally, don't know how to start.

 

[Steve4Physics]

Literally, don't know how to start.

Always start with a free body (force) diagram.