The $20$ angle is parallel to the $xy$ plane.

The coordinate system origin is in the centroid of the

base triangle. Point $G$ is $3$ meters above that point.

The equilateral base triangle has sides of $2m$ each.

A$)$ Use sum of moments about $B$ to find reactions $Az,Cz,$ and $Cx.$

B$)$ Use point equilibrium at G to get GF$,$ GE$,$ and GD member forces.

C$)$ List the zero force truss members.