topong dijawab ya.. makasih

Fx=F1sinalfa+F2sinbeta-(F3sinj+F4sintehta)
=40sin50+60sin20-80sin45-90sin75
=30.64+20.52-56.56-86.93=-92.33N
Fy=40cos50+90cos75-60cos20-80sin45
=-63.94N
Fr=((-92.33)^2 +(-63.94)^2)^1/2 =112.3N