108) A pin-jointed plane frame is unstable if [where m is number of members, r is reaction components and j is number of joints]

109) A rigid-jointed plane frame is stable and statically determinate if [where m is number of members, r is reaction components and j is number of joints]

110) The number of independent equations to be satisfied for static equilibrium in a space structure is

111) The degree of static indeterminacy of a pin-jointed space frame is given by [where m is number of unknown member forces, r is unknown reaction components and j is number of joints]

112) The degree of static indeterminacy of a rigid-jointed space frame is [where m, r and j have their usual meanings]