Help with Statics: Failing to See Force Fbc's Angle

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The discussion revolves around understanding the angle of force Fbc in statics problems. The user is struggling to see why Fbc is applied at an angle when summing moments around point A, specifically how it relates to the multiplication by 5/13. Clarification is sought on the calculation of moments at a section passing through point E. The importance of visualizing forces and their angles in statics is emphasized for accurate problem-solving. Understanding these concepts is crucial for mastering statics.
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I'm sort of self-teaching statics. Failing to see why when they sum moments around A, the force Fbc is coming in at an angle (and hence being multiplied by the 5/13). Can someone please clarify?
 

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Welcome to PF;
The question asks to calculate the moments etc "at a section passing through point E".
 

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