Elements of geometry, containing books I and II with exercises and notes (1882)
Smith, J. Hamblin (James Hamblin), 1829-1901 · Toronto : Gage · leaf 27
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. … JB S C Let BAC be the given angle. It is required to bisect / BAC. In AB take any pt. D. In AC make AE=AD, and join DE. On DE, on the side remote from A, describe aneqnilat. a DFE. Join.4i?. Then ^2?will bisect i BAC. For in As AFD, AFE, . AD=AE, and AF is common, and FD=FE, .-. z DAF= L EAF, that…
Geometry
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