Part A

The square plate is deformed into the shape shown by the dashed lines. $($Figure $1)$

If $DC$ has a normal strain $lo{n}_x=0\mathrm{.}004,DA$ has a normal strain $lo{n}_y=0\mathrm{.}003$ and at $D,{}_{xy}=0\mathrm{.}02$rad, determine the average normal strain along diagonal $CA.$

Express your answer in millimeters per millimeter to three significant figures.

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