ABC triangle is drawn on the thin plate in the figure when it is unloaded. $AB$ length is

parallel to the $"x"$ axis and measured as $\frac{?}{\text{b}\text{a}\text{r}}(AB)=20cm.$ Determine:

a$)$ the final length of side $BC.$

b$)$ the amount of change of side AC$.$

c$)$ the amount of change in plate thickness.

d$)$ the final volume of the plate.

$E=70$GPa

$v=\frac{1}{3}$ K$=17$ so variable is $107$ MPA