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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 163

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 163
les to the plane which passesthrough them, that is, to the plane in which they are.^ Let the straight line EF stand at right angles to each of thestraight lines AB, CD in E, the point of their intersection: EF isalso at right angles to the plane passing through AB, CD. Take the straight lines AE,… … * See Note. BOOIC XI. THE ELEMENTS OF EUCLID. 161 two straight lilies, AE, ED are equal to the two BE, EC, and thatthey contain equal angles (15. 1.) AED, BEC, the base AD isequal (4. 1.) to the base BC, and the angle DAE to the angleEEC: and the angle AEG is equal to the angle BEH (15.…

Mathematics, Greek · Geometry · Trigonometry

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