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 23
h more then is theangle BDC greater than the angleBCD. Again, because CB is equal to DB, the angle BDC is equal(5.1.) to the angle BCD; but it has been demonstrated to be greaterthan it; which is impossible. But if one of the vertices, asD, be within the other triangleACB; produce AC, AD to E,F;… … B the angle FDC is likewise greater than BCD; much more then is theangle BDC greater than the angle BCD. Again, because CB is eqaalto DB, the angle BDC is equal (5. 1.) to the angle BCD; but BDChas been pro^ ed to be greater than the same BCD; which is impossi-ble. The case in which the vtt-tex of…
Euclid's Elements · Geometry · Trigonometry
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