What is the missing angle in a system of concurrent parallel forces?

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The discussion revolves around calculating the missing angle in a system of concurrent parallel forces. The user has determined the angles and components for two forces, f1 and f2, but struggles to find the angle for the third force. They mention having the x and y values for the first two forces and seek guidance on how to incorporate these into the resultant force (Fr). The user is unsure how to add the components of the vectors without knowing the angle for the third line. Overall, the thread highlights the complexities involved in vector addition in physics.
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I have a problem where i have found the angle for one line but i can't find the angle for the other. See attached picture i couldn't find how to add the picture to the post without a url for it. so far i have the x and y values for two line I am only missing the third line.
f1 = 1570 lb ^x 0 lb ^y
f2 = 532 lb ^x 1740 ^y i got 17 degrees as an angle for this line
fr=
attachment.php?attachmentid=6167&stc=1&d=1138338660.jpg
 

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click the link for the photo
 
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add the components of the vectors
 
without the angle i wouldn't be able to add Fr it would be FRCOs? FrSIn? how am i supposed to add that??
 
add the x components of the first two vectors (this is the x component of the Fr vector)

add the y components

these two are your components of the Fr vector
 
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thanks......
 
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