Theodosius <Bithynius>; Clavius, Christoph
,
Theodosii Tripolitae Sphaericorum libri tres
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<
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">_QVAMVIS_ autem Theorema hoc proponatur ſolum de arcubus illis inæqualin
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bus, quorũ maiori maior chorda ſubtenditur, quam minori: </
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<
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">_I_dem tamen locum etiam
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habet in illis arcubus inæqualibus, quorum maioris chorda minor eſt, quam chordæ
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minoris. </
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<
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">_N_am quia tunc arcus maior ad minorem habet proportionẽ maioris inæqua-
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litatis, chorda vero maioris arcus ad chordam minoris arcus proportionem habet mi-
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noris inæqualitatis, maior erit proportio maioris arcus ad minorem, quam chordæ
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arcus maioris ad chordam minoris arcus.</
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iorem, quam chordæ minoris arcus ad chordam maioris. </
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<
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">Cum enim maior arcus ad mi-
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norem habeat maiorem proportionem, quam chorda maioris arcus ad chordam minoris,
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vt demonſtratum eſt; </
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<
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">habebit conuertendo minor arcus ad maiorem, minorem propor-
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tionem, quam chorda arcus minoris ad chordam maioris.</
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lũ ſub dia-
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metris qua
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drilateri in
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circulo de-
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ſcripti con
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tentũ æqua
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le eſt duo-
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bus rectan-
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gulis ſub
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oppoſitis la
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teribus con
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tentis.</
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ſuis diametris; </
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prehenſum æquale duobus rectãgulis ſimul, quæ
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ſub lateribus oppoſitis continentur.</
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">Dico rectangulum ſub AC, BD, comprehenſum æquale eſſe rectangulis ſi-
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mul ſub AD, BC, & </
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angulus BAE; </
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rectam, & </
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in primo caſu angulus BAC, angulo DAE; </
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lus BAC,
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toti angulo
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DAE, pro-
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pter cõ mu-
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nem angu-
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lum EAC,
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additum; </
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& </
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caſu reli-
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quus angu-
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lus BAC, reliquo angulo DAE, ob communem angulum EAC, ablatum
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æqualis. </
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reliquus etiam angulus ABC, in triangulo ABC, reliquo angulo AED, in
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triangulo AED, æqualis. </
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re rectangulum ſub AC, DE, æquale eſt rectangulo ſub CB, AD. </
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quia angulus BAE, angulo DAC, ex conſtructione æqualis eſt; </
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<
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ABD, angulo ACD: </
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