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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 222

An illustration from 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, leaf 222
GH, HE, each into two equal * See Note. t Vertex is put ip place of altitude, which is in the Greek, because the pyra-mid, in what follows, is supposed to be circumscribed about the cone, and somust have the same vertex. And the same change is made in some places fol-lowing. . BOOK XII. THE… … C E

Mathematics, Greek · Geometry · Trigonometry

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