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 40
cause AB is parallel to CD, andBC meets them, the alternate anglesABC, BCD are equal (29. 1.) to oneanother; and because AC is parallelJo BD, and BC meets them, the al-ternate angles ACB, CBD are equal(29. 1.) to one another; wherefore C \i the two triangles ABC, CBD have two angles ABC, BCA in… … 4,0 ELEMENTS the third angle of the one to the third angle of the other (36. 1.),viz. the side AB to the side CD, and AC to BD, and the angle BACe^ual to the angle BUG. And because the angle ABC is equal to theangle BCD, and the angle CBD to the angle ACB, the whole angleABD is equal to the whole…
Euclid's Elements · Geometry · Trigonometry
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