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 55
52 THE ELEMENTS OF EUCLID. BOOK II, … First, Let AD fall within the triangle ABC; and because thestraight line CJ^ is divided into two partsin the point Dylhe squares of CB, BD areequal (7. 2.) to twice the rectangle contain-ed by CB, BD, and the square of DC: toeach of these equals add the square ofAD; therefore the squares of CB, BD,…
Mathematics, Greek · Geometry · Trigonometry
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