$3-23.$ Determine the force in members $GF,CF,$ and $CD$ of

the roof truss and indicate if the members are in tension or

compression.

$C+{\displaystyle \underset{?}{\overset{?}{}}}{M}_A=0$;$,E_y(4)-2(0\mathrm{.}8)-1\mathrm{.}5(2\mathrm{.}50)=0,E_y=1\mathrm{.}3375kN$

Method of Sections:

$C+{\displaystyle \underset{?}{\overset{?}{}}}{M}_C=0$;$,1\mathrm{.}3375(2)-F_{GF}(1\mathrm{.}5)=0$

$,F_{GR}=1\mathrm{.}78kN(T)$

Ans.