Indeterminate Structures

The indeterminate structure rig $($Figure $1)$ consists of three pin$-$jointed members made of the

same type of steel. The top member is at $45$ to the vertical. The middle member is horizontal

and the bottom member is at an angle of $60$ to the vertical; the bottom member is $1m$ long

between pins. The outside diameter of the steel tubes is $25\mathrm{.}4mm$ and the wall thickness is $1\mathrm{.}2$

$mm.$ Young's Modulus of the steel tubes of the rig is $210$GPa.

Figure $1$: Test rig used $($left$)$ and schematic drawing of the frame of the rig $($right$)$

Do I need to work out the lengths or assume they are all the same?