The first six books of the elements of Euclid : with a commentary and geometrical exercises ; to which are annexed a treatise on solid geometry, and short essays on ancient geometrical analysis, and the theory of transversals (1861)
Lardner, Dionysius, 1793-1859 · London : Print. for Taylor and Walton · leaf 200
ut harmonically. This is evident from what has been already proved (533). See note on Transversals. App.III. *%* (535) It follows from this and the first proposition that the bisector of an angle of a triangle divides it into two triangles proportional to the sides which include the bisected angle,… … Proposition IV. Theorem, (537) In equiangular triangles (B A C and C D E) thesides about the equal angles are proportional,and the sides which are opposite to the equalangles are homologous. Let sides B C and C E, which are opposite to equal anglesB A C and C D E, be placed so that they may form e…
Geometry
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