Cavalieri's Cones
thingiverse
The two cones have equal cross-sectional areas, and hence equal volumes. The pair makes a nice hands-on demonstration of Cavalieri's Principle. Math Note: Despite the cones having equal cross-sectional areas, the thickness of the walls are not equal. This is necessary in order for the shells to hold equal volumes. Created by K. Timme in Fall 2014.
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