Theodosius <Bithynius>; Clavius, Christoph
,
Theodosii Tripolitae Sphaericorum libri tres
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100000000000000. </
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<
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">per sinus complementorum omnium arcuum, initio facto à
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ſione eiuſ-
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dé ſemper
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numeri p ſi
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nus omnes
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ſecantes in
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ueniuntur.</
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principto Quadrantis, omnium arcuum ſecantes eruuntur, vt ex demonſtratis liquet.
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<
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<
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">Tangens ar
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cus maioris
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ſemiſle qua
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diantis, cui
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tangenti, &
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ſecanti ſi-
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mul ſit æ-
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qualis.</
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drantis maior ſit, æqualis eſt tangenti & </
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<
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mul arcus, qui duplus ſit exceſſus, quo datus ar-
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cus ſemiſſem quadrantis ſuperat.</
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<
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">IN quadrante ABC, ſit CG, tangens arcus CF, qui ſemiſſe quadrantis
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maior ſit, inter ſemidiametrum AC, & </
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<
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prehenſa. </
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">Dico CG, æqualem eſſe tangenti, & </
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ſit exceſſus, quo arcus CF, ſemiſſem quadrantis
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ſuperat. </
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ducatur recta AD, extendaturq́; </
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quoniam anguli BAF, FAE, ob æquales arcus
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BF, DF, æquales ſunt: </
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eſt alternus angulus G; </
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">idem angulus
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">29. primi.</
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G, angulo GAE, æqualis. </
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æquales ſunt: </
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<
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">ac propterea, addita communi CE,
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erit CG, tota tangens arcus CF, duabus CE, & </
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AE, hoc eſt, tangenti, & </
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æqualis. </
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<
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">Dico iam arcum CD, duplum eſſe exceſ-
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ſus quo arcus CF, propoſitus ſemiſſem quadrãtis ſuperat. </
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<
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cu quadrantis ad partes B, ſumptoq́; </
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">arcus
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FB, arcui FD, ſit æqualis, erit totus arcus FH, toti arcui CF, æqualis, ac pro-
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inde arcus CH, duplus erit arcus CF. </
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">Quoniam vero arcus CH, quadrantem
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CB, ſuperat arcu BH, hoc eſt, arcu CD; </
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miſsem quadrantis CB, ſemiſse exceſſus CD. </
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ceſſus, quo datus arcus CF, ſemiſſem quadrantis ſuperat. </
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<
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CG, tangentem arcus CF, æqualem eſſe tangenti CE, & </
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<
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cus CD. </
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<
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lis eſt tangenti, & </
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<
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cus ſemiſſem quadrantis ſuperat. </
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<
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<
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<
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gens eiuſ-
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dem arcus
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cui tágenti
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ſimul ęqua
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les ſint.</
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tangenti arcus compoſiti ex dato arcu, & </
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<
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eiuſdem.</
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<
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, tangens eiuſdem arcus CD. </
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