The elements of Euclid : viz, the first six books, together with the eleventh and twelfth : the errors, by which Theon, or others, have long ago vitiated these books, are corrected, and some of Euclid's demonstrations are restored : also, The book of Euclid's data, in like manner corrected (1834)
Euclid, Euclid, Simson, Robert, 1687-1768 · Philadelphia : Desilver & Thomas · leaf 196
are parallelopipeds, as was provedin the last part of Prop. 31. of this Book. In this case likewise,if the solids AB, CD be equal, their bases are reciprocally propor-tional to their altitudes, viz. the base EH to the base NP, as thealtitude of the solid CD to the altitude of the solid AB.…
Mathematics, Greek · Geometry · Trigonometry
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