Pin jointed frames structures, using method of sections for static mechanics. $-$Complete checks to find the support reactions, and establish that the framework is stable and statically determinate. Also, prepare using a suitable scale and annotation a space diagram for the framework.

$-$Use $(1)$ the method of sections, $(2)$ graphical methods $($including calculations$)$ and $(3)$ analytical methods to determine support reactions and primary forces in the central members of a pin jointed structure.

$-$Evaluate the three different techniques you have used to justify the most appropriate methods of finding the forces in the central members of the pin jointed structure. L$1=9$KN; L$2=18$KN; L$3=15$KN;