The 100-mm-long rod has a diameter of 15 mm. If an axial tensile load of 10 kN is applied - F3-13

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F3–13. The 100-mm-long rod has a diameter of 15 mm. If an axial tensile load of 10 kN is applied to it, determine the change in its diameter.

All problems from Mechanics of Materials Eleventh Edition by Russell C. Hibbeler.
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is it not radius in the final step where you substituted 15, so shouldn't we substitute 7.5?

nitinsriram