Drawing FBD & Splitting Force Components - Quick Tips!

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AirForceOne
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Hi,

When drawing the FBD (ex. block on incline), and when you split a force into x and y components, where do you put theta when giving the angle of let's say, the incline? Is there a trick to this? I generally know where to put it (basic trig), but for some reason I can't use trig for some other forces.
 
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