Selected propositions in geometrical constructions and applications of algebra to geometry. Being a key to the appendix of Davies' Legendre (1875)
Legendre, A. M. (Adrien Marie), 1752-1833, Davies, Charles, 1798-1876 · New York, Chicago [etc.] A.S. Barnes & company · leaf 15
8 KEY. … Prop. V.—If two sides of a triangle are prolonged beyond thethird side, show that the bisectrices of the included angle and of theexterior angles, all meet in the same point. Demonstration.—Let ABC be any triangle, and let CO and BObe the bisectrices of the exterior anglesECB and DBC. Draw AO, and…
Geometry
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