(Solved): a) Determine the statical indeterminacy, r, of the structures shown below. b) Indicate with arrows ...

a) Determine the statical indeterminacy, $r$, of the structures shown below. b) Indicate with arrows $(?$ a rotation; $?$ a translation) on each structure and list beside each structure the number of structural degrees of freedom, $k$, that are required to do an analysis by the slope-defection method. In each case, use the minimum number of structural degrees of freedom; where they occur, take into account symmetry, antisymmetry and joints that are known to have zero moments.