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 285
Then, because DE is equal to AB, and AB is equal to AC, OE isequal to AC; and for the same reason, DF is equal to AB. And be-cause DF is equal to AB, DE to AC, and the angle FDE to the angleiBAC, the angle ABC is equal to the angle DFE, (4.1.). But the an-gle ACB is also, by hypothesis, equal to…
Euclid's Elements · Geometry · Trigonometry
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