The following structure has all member properties E$,$ A$,$ I. AB is a beam and CD is a truss member.

A$)$ Using the method of consistent deformations $($force method$),$ write the compatibility equation$($s$)$ necessary to solve the structure. Draw DIAGRAMS clearly indicating what each displacement term in your equation$($s$)$ means, and what force$($s$)$ are applied to evaluate that particular displacement. NOTE: By the use of diagrams and$/$or words, you must clearly describe what each displacement term means and what force$($s$)$ is applied to evaluate that term $(10$ points$).$