An equilateral cone circumscribed about a sphere ...
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Beinecke Rare Book and Manuscript Library > An equilateral cone circumscribed about a sphere ...
From p. 27: [Tacquet's] words are these: 'An equilateral cone circumscribed about a sphere, and a right cylinder in like manner circumscribed about the same sphere, and the same sphere itself continue the same proportion ; to wit, the sesquialteral, as well as in respect of the solidity as of the whole superficies.