$3.$ The figure shows a beam cross$-$section of reinforced concrete which must be checked for moment in the failure limit state. The concrete has a characteristic strength of $35$ N$/$mm$2.$ The reinforcement has characteristicstrength $500$ N$/$mm$2.$

a$)$ What will be the torque capacity of the pressure zone?

b$)$ What will be the torque capacity of the tensile zone?

c$)$ What is the moment capacity of the cross$-$section?