Question: (a) Suppose is a solid with known cross-sectional areas. Explain how to approximate the volume of by a Riemann sum. Then write an expression for

(a) Suppose is a solid with known cross-sectional areas. Explain how to approximate the volume of by a Riemann sum. Then write an expression for the exact volume.
(b) If is a solid of revolution, how do you find the cross-sectional areas?

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