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 373
Produce EF to the circumference in G, and join AG: becauseGEA is a right angle, the straight line AG is (Cor. 5. 4.) the dia-meter of the circle ABC; and BC is also a diameter of it; there-fore the point H where they meet is the centre of the circle, andconsequently H is given: and the point D is…
Mathematics, Greek · Geometry · Trigonometry
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.