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Statics and dynamics help


Higgings

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Stuck with a question for statics and dynamics, any help is appreciated. Please note this is not homework and that I already have the answers for it but I dont understand the process. 

 

Question

 

IMG_20151213_151714.jpg

 

Answer

 

IMG_20151213_151654.jpg

IMG_20151213_151705.jpg

 

What I have

 

IMG_20151213_151737.jpg

 

How do they get the points a-e, e-g, c-g, g-f, b-f?

 

Please help!

 

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