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hey . this is a simple Questions , look at pic this is a statics

[PLAIN]http://hh7.net/Sep/hh7.net_13195790041.png [Broken]

my Question . how he calculate 120 , 290 for Angles ??

[PLAIN]http://hh7.net/Sep/hh7.net_13195790041.png [Broken]

my Question . how he calculate 120 , 290 for Angles ??

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