How Do You Calculate Lateral Strain from Diameter Changes?

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The_Engineer
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I'm trying to compute lateral strain for a bar (strain that would make it thicker, or have more cross sectional area).

All I know are the initial and final diameters. This gives me d1 and Δd.

Would the lateral strain be Δd/d or ΔA/A? (A is area)
 
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