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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 165

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 165
EDA: but ABE is a right angle; therefore EDA is also aright angle, and ED perpendicular to DA: but it is also perpen-dicular to each of the tvvo BD, DC: wherefore ED is at right an-gles to each of the three straight lines BD, DA, DC in the pointin which they meet: therefore these three straight…

Mathematics, Greek · Geometry · Trigonometry

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