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 36
PROPOSITIONS FROM LEGEKDRE. 29 … ble of containing an angle equal to two-thirds of a right angle (Bk. Ill, Prob. 16); through A draw QAP parallel to the line through D and E, the centres of the segments; from the points Q and P, draw.QC and PB, and prolong them till they meet at R. Any triangle whose sides pass throughA, B, and C,…
Geometry
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