$(25$pts$)$ The same rectangle ABCD is $150$ mm wide and $200$ mm tall as shown. It is deformed

as shown into $AB{C}^{\text{'}}{D}^{\text{'}}$ :

a$.$ What is the shear strain $Y$ as corner

BAD changes to BAD'?

b$.$ What is the shear strain $y$ as corner

ABC deforms to ABC $\text{'}?$

c$.$ What is the shear strain $$ as comer

BCD deforms to $B^{\text{'}}{D}^{\text{'}}?$

d$.$ What is the shear strain $$ as corner

CDA deforms to C'D'A?