Solid parallelepipeds contained by parallelograms equiangular to one another, each to each, that is, of which the solid angles are equal, each to each, have to one another the ratio compounded of the ratios of their sides. The The Thirteen Books of Euclid's Elements - Page 347by Euclid, Johan Ludvig Heiberg - 1908Full view
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Jacob Bernoulli, Edith Dudley Sylla - Mathematics - 2006 - 430 pages
...Compounding of ratios appears in Euclid, Elements, Book VI, Proposition 23, "Equiangular parallelograms have to one another the ratio compounded of the ratios of their sides." See Edith Sylla, "Compounding Ratios: Bradwardine, Oresme, and the first edition of Newton's Principia,"...