Slope deflection method of structural analysis is
(i) displacement method of structural analysis
(ii) a method in which the joints rotate as a whole and the angles between the tangents to the elastic curve meeting at the joint do not change due to deformation
(iii) a method in which the rotations of the joints are treated as unknown.
The correct answer is
1
only (i)
2
both (i) and (ii)
3
both (i) and (iii)
4
all (i), (ii) and (iii)
5
Only (iii)