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 133
LIBER IIIL 129 Eilo CBE mam: circuli qua- … gulosad Y, €9 K, per 7 primi ba- jtss C fimilem ad G C9 H , smcti- stations (Cilicet. faperficiet quadrastis G E. C ,. 4d. faperficiem quadrantis GD C ang. Ttaque per quartum (exti elementorum , lateva que (ubter equa- es eos angulos [ast , BH 8 EG: Iteg BK C EI, fent proportionalias quod erat…
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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