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Elements of geometry : containing books I to III (1886)
Smith, J. Hamblin · Toronto : W.J. Gage · leaf 184
F ; III. .. segment ABC=segment DEF. Ax. 8. Q. E. D. We gave one Proposition, 0, page 150, as an example of th©way in which the conceptions of Flal and Reflex Angles maybe employed to extend and simplify Euclids proofs. We heregive the proofs, based <>n the same conceptions, of the impoi-taut… … Let ABCD be a quadrilateral fig. inscribed in a ®. n must <ach pair of its opposite 1 s be together equal to . L S. From 0, the centre, draw OB, OD. Then V l BOD=twice i. BAD, III. 20. and the reflex 1 D0B=Udc(- L BCD, III. C. p. 150. •. -sum of L s at 0 = twice sum of zs BAD, BCD.Eut sum of l s…Geometry
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