$3)$ The rectangular plate is deformed into the shape of a parallelogram shown by the dashed lines. Determine the average shear strain $\backslash (\backslash$gamma$\_\{\backslash$mathrm$\{$xy$\}\}\backslash )$ at corner $\backslash ($ A $\backslash ).$

A$)1\mathrm{.}671$ rad

B$)0\mathrm{.}0292$ rad

C$)0\mathrm{.}0167$ rad

D$)0\mathrm{.}0125$ rad