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 300
a triangle be bisected, and also one of theinterior and opposite, the angle contained by the bisecting lines isequal to half the other interior and opposite angle of the triangle. Let the exterior angle ACD of the triangle ABC be bisected by thestraight line CE, and the interior and opposite ABC by… … NOTES. 2^9 is^r(^aterfTian EBC; add ECB to Imth, and the two angjles ECH, ECB are c:reaterthan EBC,ECB. But ECD, ECB are e- tjiial to tworisjht ansjles; therefore ECB, EBC.areless than, two risjht an- E!;les, and therefore the lines CE, BE must meet b on the sanie side of BC on which the triaiis^le…
Euclid's Elements · Geometry · Trigonometry
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