Geometry : the elements of Euclid and Legendre simplified and arranged to exclude from geomtrical reasoning the reductio ad absurdum : with the elements of plane and spherical trigonometry, and exercises in elementary geometry and trigonometry / /c By Lawrence S. Benson (1868)
Benson, Lawrence S. (Lawrence Sluter), Legendre, A. M. (Adrien Marie), 1752-1833 · New York : Pub. for the author by Davies & Kent · leaf 229
+ AD.DC. EXERCISES. 225 … dicnlar and CF parallel to BD, and DGH perpendicular andBH parallel to AC. Then, because EF is equal to the perpen-dicular drawn from C to BI), and GH equal to the one drawnfrom B to AC; it would be prov-ed as before, that AP\AIv = BA.AD + BC.CD, and I)n.AK =AB.BC + AD.DC. Hence, AF.AK : DH.AK, or…
Geometry · Trigonometry
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