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 28
OF GEOMETRY. BOOK I. 37 … For the an^-les CE A, AED, which the straight line AE makes withthe straight fine CD<, are together equal (13. 1.) to two right angles;and the angles AED, DEB, (,which the straight line DEmakes with the straight lineAB, are also together equal(13.1.) to two right angles;therefore the two…
Euclid's Elements · Geometry · Trigonometry
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