Theodosius <Bithynius>; Clavius, Christoph
,
Theodosii Tripolitae Sphaericorum libri tres
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[Figure 371]
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[Figure 372]
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tur æquales AB, AC, erunt & </
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<
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DC, trianguli DBC, æqualia ſunt duobus
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lateribus FC, FB, trianguli FCB: </
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<
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contineant angulos æquales D, F, vt oſten-
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dimus, erunt & </
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<
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">7. huius.</
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lis FCB, FBC, æquales. </
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lis ABF, ACD, quos oſtendimus æquales
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eſſe, auferantur anguli FBC, DCB, quos
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etiam æquales eſſe demonſtrauimus, rema-
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nebunt anguli ABC, ACB, ſupra baſim
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BC, æquales: </
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<
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los DBC, FCB, infra eandem baſim BC,
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eſſe æquales. </
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<
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ter ſe, & </
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<
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">anguli infra eandem inter ſe æquales ſunt. </
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<
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">Quam ob rem Iſoſcelium
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triangulorum ſphæricorum, &</
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@uiangulum.</
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ſe fuerint: </
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ra æqualia inter ſe erunt.</
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<
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">IN triangulo ABC, ſint duo anguli B, C, ſupra latus BC, æquales. </
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co latera quoque AB, AC, illis ſubtenſa eſſe æqualia. </
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qualia, ſit, ſi fieri poteſt AB, maius. </
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niam arcus AC, minor eſt ſemicirculo, abſcin-
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datur ex arcu maiore AB, arcus BD, arcui mi-
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nori AC, æqualis; </
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culi maximi ducatur CD. </
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latera AC, CB, trianguli ACB, æqualia ſunt
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duobus lateribus DB, BC, trianguli DBC,
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continentq́; </
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">erunt triangula ACB, DBC, æqualia, totum
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& </
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qualia ſunt latera AB, AC, ſed æqualia. </
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guli igitur ſphærici duo anguli, &</
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oſtendendum.</
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laterum.</
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