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//Least value of theta to avoid slipping of ladder
//refer fig.8.21
//Applying virtual work principle
//-0.4*NA*6*cosd(theta)*delta(theta)-200*(-3*sind(theta)*delta(theta))-900*(-5*sind(theta)*delta(theta))+0.25*NB(-6*sind(theta)*delta(theta))=0
NA=1100/(1+0.25*0.4) //N
NB=0.4*1000 //N
theta=atand(2400/4500) //degree
printf("Thus theta=%.2f degree",theta)
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