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 118
114. GEOMETRIE TRIANGVLORVM ad fecantem anguli lateri minori adjacentis. Item ut femiffis refidui,eft ad latus minus : ita radius ad fecantem anguli lateri minori adjacentis.Dantur ergo duo anguli: quibus ex femicir- culo fubductis, relinquitur tertius bafi oppofitus. … | BC 28: relizqut EC 165 cujus femifis EF vw! FC eff 8 (Perpendicularisenim. AF. bifecat EC. pertertiam tertii elementorum) binc dantur anguli ad B. € C. per 8 hujus. Nam BE. ef, 12, G EF 8: emotta BE 20. Bafsautem B A Trianguli vellanguli BF A eff 25. Itaque ! Vt BF 20, «d BÁ 25: It4 BF 10000000,…
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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