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 80
dia-meter AE, AD is drawn at right angles to AE, therefore AD (Cor.16. 3.) touches the circle; and because AB drawn from the pointof contact A cuts the circle, the angle DAB is equal to the anglein the alternate segment AHB(32. 3.): but the angle DAB isequal to the angle C, thereforealso the angle…
Mathematics, Greek · Geometry · Trigonometry
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.