The adjacent figure is the part of a horizontally stretched net. section AB is stretched with a force of 10 N. The tensions in the sections BC and BF are

By drawing the free body diagram of point B Let the tension in the section BC and BF are T1 and T2 respectively.From Lami's theoremT1sin120°=T2sin120°=Tsin120°⇒T=T1=T2=10 N.