A thin triangular plate $PQR$ forms a right angle at point $Q.$ During deformation, point $Q$ moves to the left by $u=1\mathrm{.}5mm$ and upward by

$v=5\mathrm{.}9mm$ to new position $Q^{\text{'}}.$ Determine the shear strain $$ at corner $Q^{\text{'}}$ after deformation. Use $c=630mm,a=31,$ and $=59.$

Answer:

$=$

$rad$