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 130
€9 proinde latus D A ma- Jus latere. B À circuli quadrante : f[m E C A con[Htuatur acutus, erit B. C A veHus 5 € proinde E. À minus B A quadrante : quod erat oflendendum. ro. 5i trianguli rectanguli latus alterum fit quadrans circu- li;etiam bafis quadrans eft ; fi vero utrumque latus quadrante… … BC afin etiam circuli quadrantem e[fe. INam per premif[nm Theorema, angulus ad C reilus efl: €9 proimde aves. A B 68. CB, gormaliter egredumtur ex C À circumferentia , concurrant autem ia. B pol. Itaque per. 2, porifmna quarti hojus, maximorum circulorum quadrantes funt. Converfa hujus partis…
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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