Elements of geometry : containing the first six books of Euclid, with a supplement on the quadrature of the circle, and the geometry of solids : to which are added, Elements of plane and spherical geometry (1826)
Playfair, John, 1748-1819, Euclid · Philadelphia : Marot & Walter · leaf 123
equal angles, by the straight line AD. Tlie same conslruction being made; because, asBD to DC, so isBA to AC; and as BD to DC, sois BA to AE {2. 6.), because ADis parallel to EC; therefore ABis to AC, as AB to AE (ll. 5.):Consequently AC is equal to AE(9. 5.), and the angle AKC istherefore equal to…
Euclid's Elements · Geometry · Trigonometry
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