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 139
136 THE ELEMENTS OF EUCLID. BOOK VI. Take two straight lines DE, DF, containing any angle EDF:and upon these make DG equal to D A, GE equal to B, and DH equal ^ \ to C; and having joined GH, draw EF parallel (31. I.) to it through / \ S the point E: and because GH isparallel to EF, one of the sides…
Mathematics, Greek · Geometry · Trigonometry
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