# Percentage Errors in Approximating the Volumes of a Wine Barrel and a Goblet

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The German astronomer Johannes Kepler (1571–1630) found that the planets orbit the Sun in ellipses and showed that comets increase in speed as they near the Sun. He also estimated the volume of a wine barrel with height , base and top radii , and midsection radius as:

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Contributed by: Abraham Gadalla (August 2011)

Open content licensed under CC BY-NC-SA

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