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 158
square of AD. Wherefore, if an angle. Sec. Q. E. D. PROP. C. THEOR. If from any angle of a triangle a straight line bedrawn perpendicular to the base; the rectangle con-tained by the sides of the triangle is equal to the rect-angle contained by the perpendicular and the diameterof the circle… … scribed about the triangle. Sec Note. 156 THE ELEMENTS OF EUCLID. BOOK VI. Describe (5. 4.) the circle ACBabout the triangle, and draw its dia-meter AE, and join EC; because theright angle BDA is equal (31. 3.) tothe angle EGA in a semicircle, andthe angle ABD to the angle AEC inthe same segment…
Mathematics, Greek · Geometry · Trigonometry
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