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A Machinist Measures the Radius and Cross-Sectional Area of a Metal

Question 85

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A machinist measures the radius and cross-sectional area of a metal rod. After machining the rod down and cutting its radius in half, and then by another 1.0 millimetre, the cross-sectional area has gone down by 15 mm215 \mathrm{~mm}^{2} . What was the original radius of the rod?

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