The two bars are used to support load $P.$ When unloaded, joint $B$ has coordinates $(0,0).$ After load $P$ is applied, joint $B$ moves to the coordinate position $(-0\mathrm{.}57$ in $.,-0\mathrm{.}17$ in $.).$ Assume $a=10ft,b=20ft,c=7ft,$ and $d=14ft.$ Determine the normal strain in each bar.

Part $1$

Calculate the orignal length of each bar.

Answer:

$L_{AB}=$ in$.$

$L_{BC}=$ in$.$