Equation for sum of torques on a ladder and minimum angle

[Howard Fox]

Homework Statement

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Homework Equations

Drawing a diagram for the forces is the easy part. I am not sure I am doing the equation of the sum of the torques well.

The Attempt at a Solution

This is my attempt for the forces[/B]

And this for the torques:

 

[kuruman]

If you calculate torques about the point of contact with the ground, there are 3 torques to consider not just 2. You missed the torque generated by $F_{f2}$ at the point of contact with the wall.