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//Force in the member FH
//refer fig.8.22
//use symmetry
//Apply virtual work principle
//RA*12*delta(theta)-10*10*delta(theta)-10*6*delta(theta)-10*2*delta(theta)+FFH*2*tand(60)=0
FFH=-240/(2*tand(60)) //kN
printf("FFH is a compressive force of %.2f kN",-FFH)
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