it is the tangent- As in the annexed Dfctgram, the tangent H G is perpendicular from the end of the Diameter BAG, to the Radius A E continued through theterm of the arch E G unto H, agreeing both tothe arch E G, and to its complement to a Semi-circle BCE. 26 As the fine complement of an arch, is… … Theref3re, A G .»H G,the tangent of the arch E G, as was to be proved.Confettary, Therefore the fine and fine complement of an arch being given, the tangent and tangentcomplement of the fame arch is alfo given. For if A F be the fine of 49 degrees 1 and E F thefine of 41, H G (hall be the tangent…
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![An illustration from Il terzo [-qvinto] libro ... (1551)](https://img.insideoutlibrary.com/img/200/ia-ilterzoqvintolib00serl-12-20.webp)
![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-81-57.webp)
