Philippi Lansbergii Triangvlorvm geometriae libri qvatvor : in quibus novâ & perspicuâ methodo, & apodeixei [romanized], tota ipsorum triangulorum doctrina explicatur .. (1631)
Lansberge, Philippe van, 1561-1632 · Amsterdami : Apud Gvilielmvm Blaevw · leaf 146
142 GEOMETRIE TRIANGVLORVM Velper idem Theorema , ) ad (écantem cop. (Tta tang. vel-) — ue PS d Y S lues AC 4 quilt. AB» s vid 27 n ad Cg Vt vadis ] 12018535 (| 4803931 ] NL aUDEFET 10000000 Quarto , data bafi & angulo , K inveftigatur latus adjacens. Nam … tangentem lateris angulo dato adjacentis. Aut,radius eft ad fecantem anguli dati: ut tangens complementi bafis , ad tangentem complementi lateris dato angulo adjacentis. | "Affumpto €. bic "Triangulo AB C. vetlangulo, detur bafis B C part. 6o: €? angulus ad. C. partium. 30. tirvenietur latus AC.…
Trigonometry -- Early works to 1800
Internet Archive · Fisher - University of Toronto · Public domain (published before 1931). Free to use for anything.
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