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 154
150 GEOMETRIE TRIANGVLORVM Quin C) latus B C eadem methodo imve- … tim quadrante minores fft. Praeterea in Tri angulo vetlangalo A D C dam bafis. A C part. yo , augulas ad. C. par- "Umm 30, cum latere AD part. 22 31. xg. Quare pev. 4, poifzpa x2. bujus , uelper. 2, aut. 4, decimiterti , laus D C. eff part. 4g $4. 16^, quadrante venus , quia bafis C8 latus datum.…
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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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-271-175.webp)