1. The problem statement, all variables and given/known data The modulus of elasticity of each member is E = 20kN/(mm^2) and the cross section of each member is 1000(mm^2) , except member EB and EC is 40(mm^2) , determine : a) The vertical displacement at joint C b) The horizontal dispalcemnet at joint C at A , it's a pinned support , so there must be 2 reactions , right ? 2. Relevant equations 3. The attempt at a solution Why the author showed one reaction( horizontal reaction) only ? Is it wrong ?