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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 39

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 39
A E G CG (31.1.) parallel to EF: thereforeEECG is a parallelogram: and be-cause BE is equal to EC, the trian-gle ABE is likewise equal (38. 1.) tothe triangle AEC, since they are uponequal bases BE, EC, and betweenUie same parallels BC, AG; there-fore the triangle ABC is double ofthe triangle AEC;… … BOOK I. THE ELKMENTS OF EUCLID.

Mathematics, Greek · Geometry · Trigonometry

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