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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 353

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 353
350 Euclids DATA. centre E, draw EA, EB, EC, EDj because the angle BAG isgiven, the angle BEC at the centre, which is the double (20. 3.)of it, is given. And the ratio of BE to EC is given, because theyare equal to one another^ therefore (44. dat.) the triangle BEC isgiven in species, and the ratio…

Mathematics, Greek · Geometry · Trigonometry

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