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 29
28 ELEMENTS … D BC be bisected, it may be tletnonstrated that the anp^le BCG, that m^(15. 1.), the angle ACD, is greater than the angle ABC. Thereforeif one fiide, 4-c. Q. E. D. PROP. XVII. THEOR. Any two angles of a triangle are together less than tworight angles. Let ABC be any triangle; any 4 two of its…
Euclid's Elements · Geometry · Trigonometry
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