Marci of Kronland, Johannes Marcus, De proportione motus figurarum recti linearum et circuli quadratura ex motu, 1648

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ducantur chordæ AF AB.
BF: dico lapſum per duas chordas
AB. BF eſſe æqualem lapſui per chordam AF.
Producatur e­
nim AB in G: & ſit AG æqualis chordæ parallelæ FL: Ex F
autem excitetur linea perpendicularis ad BF: dico hanc pro­
ductam ſecare AG in G.
Quia ením arcus FB eſt æqualis ar­
cui AL, ſubtendet chorda LF, hoc eſt illi æqualis AG grad: 135
corda vero AB grad. 45.
Auferatur AB partium 76, 3668 ex
AG partium 18477590: atque reſidua BG erit partium
10823922.
Et quia per Lemma huius angulus FBG eſt

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