(Solved): The piece of plastic is originally rectangular. Suppose that \( a=260 \mathrm{~mm} \) and \( b=440 ...

The piece of plastic is originally rectangular. Suppose that \( a=260 \mathrm{~mm} \) and \( b=440 \mathrm{~mm} \). (Figure 1) Determine the average normal strain that occurs along the diagonal \( A C \). Express your answer using three significant figures. Part B Determine the average normal strain that occurs along the diagonal \( D B \). Express your answer using three significant figures.