How Is the Right Triangle Used in Truss Force Calculations?

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The discussion centers on understanding the application of right triangles in truss force calculations for a Statics problem. The original poster is confused about how to use the right triangle to compute forces, specifically referencing terms like (4/5)Tcd and 130(12/13). Respondents emphasize the importance of basic trigonometry, including the sine, cosine, and tangent ratios, in solving such problems. They suggest that familiarity with these concepts is essential for success in Statics. Overall, a solid grasp of right triangle relationships is crucial for accurately calculating forces in truss systems.
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Hi, I have a, I believe simple, problem. I am studying for a Statics final and while doing problems with a Truss I came to a problem that I did not know how to solve. It is already solved for me, but I do not get how. The truss has a force coming out from the side but instead of an angle there is a right triangle. I do not understand how to use the triangle. I will upload a picture of the problem and the answer. If anyone can help me understand how the triangle is being used to compute the problem I would greatly appreciate it! Thanks in advance!

For example I do not understand where or why they get (4/5)Tcd or 130(12/13)

Direct Link:: http://i.imgur.com/ee9zP.jpg

ee9zP.jpg
 
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oh nvm i think i got it, 3, 4 , 5 triangle!
 
Shouldn't you be familiar with basic trigonometry in order to deal with statics? What are the relations in a right triangle?
 
I think you need to do some revision before your final. Look up the ratios of sine, cosine and tan.
 
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