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Book Ii., in Ten Propositions, Is Entirely Devoted to Finding the Centre

Archimedes · Thomas Little Heath — chapter 10 of 12 · ~24 words · public domain

of gravity of a parabolic segment, an elegant but difficult piece of geometrical work which is as usual confirmed by the method of exhaustion.

Archimedes · The Wunder Library — complete classics, free to read, with narration.