Calculating Total Moment of Force F1 about Point A

[United]

Homework Statement

http://i.imgur.com/Laub8lL.png
Find the total moment created by force F1 about point A.

Homework Equations

moment = perpendicular distance x force

The Attempt at a Solution

I got my resultant distance to be squrt(20). With this in mind, I plugged into my calculator:
sqrt(20) x 12 x (insert values listed below)
(numbers in degrees)
cos(35)
sin(35)
cos(55)
sin(55)

and I've had no luck with any of this.

Please help me

 

[Basic_Physics]

The moment is
FL sin(θ)
where θ is the angle between the line connecting point A and the point where F acts on the structure and the line of action of the force

 

[United]

How do i find theta though?

 

[Basic_Physics]

See drawing

 

[haruspex]

Call the point where the right-angled bend is B.
Drop a perpendicular from B to the line of the force. What's the length of it?
Drop another from B to a line through A parallel to the force. What's the length of that?