Problem $1$: In the following given structure, the length of each segment DC$=6$ m$,$ CB$=6$ m$,$ and BA$=12$m$,$

and force and angles are given in the figure below. $(1)$ Use the two$-$line method to draw and determine the

arm for calculating the moment of force F about the point A$,(2)$ write the moment calculation $($conceptual

expression$),$ and $(3)$ determine the sign of the moment $($i$.$e$.,$ positive or negative$)$ if the counterclockwise

rotation is the positive direction of the moment. $(15$ points$).$Problem $1$: In the following given structure, the length of each segment $DC=6m,CB=6m,$ and $BA=12m,$

and force and angles are given in the figure below. $(1)$ Use the two$-$line method to draw and determine the

arm for calculating the moment of force F about the point A$,(2)$ write the moment calculation $($conceptual

expression$),$ and $(3)$ determine the sign of the moment $($i$.$e$.,$ positive or negative$)$ if the counterclockwise

rotation is the positive direction of the moment. $(15$ points$).$