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On conoids and spheroids

treatise by Archimedes about the revolution of conic sections about their axes, whose principal result comparing the volume of any segment cut off by a plane with the volume of a cone with equal base and axis

Pronunciation
/ɒn ˈkəʊnɔɪdz ənd ˈsfɪərɔɪdz/
/ɑn ˈkoʊnɔɪdz ænd ˈsfɪrˌɔɪdz/