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