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 24
OF GEOMETRYD BOOK I. 23 … to DF; and also the base BC equal to the base EF. The angle B ACis equal to the angle EDF. For, if the triangle ABC be applied to the trian^e DEF, so thatthe point B be on E,and the straight line BC upon EF; the point Cshall also coincide with the point F, because BC is equal to EF:therefore BC…
Euclid's Elements · Geometry · Trigonometry
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