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

jmao15
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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.
IMG_20210530_172134.jpg
 
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jmao15 said:
Literally, don't know how to start.
Always start with a free body (force) diagram.
 
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