The elements of Euclid for the use of schools and colleges; comprising the first six books and portions of the eleventh and twelfth books; (1903)
Euclid, Todhunter, I. (Isaac), 1820-1884, ed. edt, Simson, Robert, 1687-1768, ed. edt · London; New York, Macmillan · leaf 44
ior bisectors of the angles BAC] ##4. If four straight lines meet at a point so that the opposite anglesare equal, these straight lines are two and two in the same straightline. 32 EUCLIDS ELEMENTS. Proposition 16. Theorem. If one side of a triangle be produced, the exterior angle shallhe greater… … because Construction, Bisect AC at E, [I. 10. join BE and produce it to F, making EF equal to EB, [I. 3. and join FC. Proof. In the triangles AEB, CEF, AE = EC, [Constructiorio and EB = EF, [Construction. I and the angle AEB = the angle CEF,since they are opposite vertical angles; [I. 15. therefore…
Euclid's Elements · Geometry · Mathematics, Greek
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