Selected propositions in geometrical constructions and applications of algebra to geometry. Being a key to the appendix of Davies' Legendre (1875)
Legendre, A. M. (Adrien Marie), 1752-1833, Davies, Charles, 1798-1876 · New York, Chicago [etc.] A.S. Barnes & company · leaf 44
PROPOSITIONS FROM LEGENDRE. 37 … Draw AE perpendicular to, and equal to, AB; draw EO, cuttingthe semicircumference in D; draw DC -^ parallel to AB ; also, draw DF and CG per-pendicular to AB; draw OC. The triangles OAE and OFD are similar;but, OA = -|-AE, and consequently OF ==•iFD. The triangles OFD and OGC areequal in all their…
Geometry
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