5*угол1+60=180
угол1=120/5=24
угол2=48
угол3=108
sin24=cb/ab=0.4
cb=0.4*ab=5.92
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5*угол1+60=180
угол1=120/5=24
угол2=48
угол3=108
sin24=cb/ab=0.4
cb=0.4*ab=5.92