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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 84

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 84
ual to the straight line DB;and FE is equal to FB, wherefore DE,EF are equal to DB, BF; and the baseFD is common to the two trianglesDEF, DBF; therefore the angle DEFis equal (8. 1.) to the angle DBF: butDEF is a right angle, therefore alsoDBF is a right angle: and FB, if pro-duced, is a diameter,… … * See Note. ■■^:: THE ELEMENTS OF EUCL.ID. JBOOK IV. DEFINITIONS.

Mathematics, Greek · Geometry · Trigonometry

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