D E TRIANGULORUM zSMENSVRATWNE. C A P. I. Tr^nofcenda qmdam $ro calculo Triangu*lorum utrmfque generis, Riangulum planum intelligitur contineri fub tribus re&is liners: Et Triangulum Spha> ticum fub tribus arcubus five peiiferiis maximorum circulorum. Nam ficuc in piano breviflimum fpacium… … EO II. Triangulum reflangulum notatur Uteris ABC, ucA Temper fie Angulus Redus, B A Bafis, CA Cathetus,B C Hypotcnufa: B angulus adBafcm, C angulus ad Ca-ihecun. Triangulum vcro Obliquangulum notetur UterisB C D, ut Catheto ex C du&a, in bina Triangula, commu-nem CathctumC…
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