Theodosius <Bithynius>; Clavius, Christoph
,
Theodosii Tripolitae Sphaericorum libri tres
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proportionalis eſt inter AC, FC; </
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<
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">erit rectangulum ſub AC, FC, æquale
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<
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">15.ſexti.</
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quadrato rectæ CD. </
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<
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xml:space
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">Cum ergo illud notũ ſit, ob notas AC, FC; </
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<
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<
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dratum ex DC, notum: </
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<
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<
s
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notam. </
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<
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xml:space
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">Quare ex data chorda cuiuſuis arcus chordam ſemiſsis illius arcus in-
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uenimus. </
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<
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xml:space
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<
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<
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<
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<
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">inueniatur chorda arcus, qui cum arcu datæ chordæ ſemicir-
<
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<
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xlink:label
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note-194-02
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">Praxis.</
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culum conſicit; </
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<
s
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xml:space
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">inuentæ autem huius chordæ dimidium ex ſemidiametro detrahatur, & </
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<
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<
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reliquus numerus in diametrum multiplicetur, dabit radix quadrata huius producti chor-
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dam ſemiſsis illius arcus, cuius chorda data eſt. </
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<
s
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xml:space
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">Vel ſi reliqui illius numeri quadratum iun
<
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gatur quadrato ſemiſsis chordæ datæ, componetur numerus, cuius radix quadrata chordam
<
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quæſitam exhibebit cognitam. </
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<
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xml:space
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">Quæ quidem operatio facile colligitur ex figura, & </
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<
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<
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mon ſtratione huius propoſ.</
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<
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<
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<
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<
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">reperiatur chorda arcus, qui cum arcu datæ chordæ ſemicircu-
<
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lum conſicit; </
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<
s
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xml:space
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">inuenta autem hæc chorda ex dia metro detrabatur, & </
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<
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xml:space
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">reliqui numeri dimi-
<
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dium in diametrum multiplicetur, dabit radix quadrata huius producti chordam ſemiſſis
<
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/>
illius arcus, cuius chorda data eſt. </
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<
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xml:space
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">Vt perſpicuum eſt ex figura, & </
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<
s
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xml:space
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">poſteriori demonſtra-
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tione huius propoſ.</
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<
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">PROBL. 8. PROPOS. 16.</
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<
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<
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">CHORDAS omnium arcuum ſemicirculi
<
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<
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xml:space
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">Qua ratio-
<
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tione om-
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niu arcuũ
<
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chordæ ſup
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putentur.</
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ſeſe ordine ſuperantium vno Minuto, in partibus
<
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diametri in quotius particulas diſtributæ, ſuppu-
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tare.</
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<
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<
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<
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">STATVAMVS, chordas omnium arcuum ſupputandas eſſe reſpectu
<
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diametri in partes 200000. </
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<
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<
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xml:space
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">Quod vt fiat accuratius, ponenda erit
<
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in ſupputationibus diameter partium 20000000. </
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<
s
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xml:space
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">Ita enim fiet, vt abiectis dua-
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bus primis figuris ad dexteram ex ſingulis chordis inuentis, relinquãtur chor-
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dæ magis exquiſitę reſpectu diametri partium 200000. </
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<
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tium propoſ. </
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<
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<
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rum ſinus totus aſſumi debeat in ſupputatione, ſi ſinus totus in tabula plu-
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rium particularum deſideretur. </
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<
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">Quod etiam de tota diametro hic intelligi
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debet, ſtatuendo ſemper diametrum duplo plurium particularum in ſuppu-
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titione, quam ſinum totum ibi conſtituimus.</
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<
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<
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grad. </
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<
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<
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<
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<
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<
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<
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xml:space
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">& </
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<
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<
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<
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xagoni, pentagoni, quadrati, & </
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<
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</
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<
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<
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<
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<
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">17320508. </
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<
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<
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ter ſtatuitur. </
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<
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<
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<
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<
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<
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<
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<
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72. </
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<
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">inuenientur chordæ arcuum reliquorum in ſemicirculo, vt grad. </
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grad. </
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<
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<
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<
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<
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<
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<
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<
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nium arcuum, qui differentiæ ſint duorum quorumlibet arcuum, quorũ chor-
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dæ ſint notæ. </
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<
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<
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<
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">ex chorda arcus grad. </
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<
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<
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niemus chordam arcus grad. </
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<
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<
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