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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 73

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 73
PROP. XXII. THEOR. The opposite angles of any quadrilateral figuredescribed in a circle, are together equal to two right angles. * See Note. … 70 THE ELEMENTS OF EUCLID. BOOK III. Let ABCD be a quadrilateral figure in the circle ABCD; anytwo of its opposite angles are together equal to two right angles. Join AC, BD; and because the three angles of every triangleare equal (32. 1.) to two right angles, the three angles of the tri-angle CAB,…

Mathematics, Greek · Geometry · Trigonometry

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