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 41
FD,DC, each to each; but the exterior angle FDC is equal (39. 1.)to the interior EAB, wherefore the base EB is equal to the base FC» OF GEOMETRY. BOOK I. 41
Euclid's Elements · Geometry · Trigonometry
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