Elements of geometry, containing books I and II with exercises and notes (1882)
Smith, J. Hamblin (James Hamblin), 1829-1901 · Toronto : Gage · leaf 26
Then in t^ABD, v BD=BA, :. z BAD= l BDA, I. A.And in aACD, . CD=CA, .: l CAI)= l CDA, I. A.Hence since the whole angles BAD, BDA are equal,and parts of these CAD, CDA are equal... the remainders BAC, BDC are equal. Ax. 3. Then, as in Case I., the equality of the original trianglesmay be proved.… … Then in ^ABD, v BD=BA, .-. z BAD= z BDA, I. A.that is, iBAC= i BDC. Then, as in Case I., the equality of the original trianglesmay be proved. Q. E. D. E i ^CL IDS EL EMENTS. [Book I. Proposition IX. Problem.To bisect a given anrjle.
Geometry
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