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

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SUMMARY

The discussion centers on understanding the calculation of moments in statics, specifically regarding the force Fbc and its angle of application. The user is struggling to comprehend why Fbc is multiplied by 5/13 when summing moments around point A. The clarification sought involves the geometric interpretation of the force's angle in relation to the section passing through point E, which is critical for accurate moment calculations in statics.

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greekniko
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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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