Theodosius <Bithynius>; Clavius, Christoph
,
Theodosii Tripolitae Sphaericorum libri tres
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æqualis; </
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<
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<
s
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">in triangulis rectangulis SkT, XAV, reliqui anguli
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T, XAV, æquales erunt.</
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<
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quadrans. </
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">abſciſſo quadrante AL, ex AC,
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deſcribantur ex polis A, B, ad in-
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terualla quadrantum AL, BC,
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maximi circuli DEF,
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:
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AC, circulus nõ maximus
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CN,
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& </
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<
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monſtrabitur, vt ibi, ita eſſe qua-
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dratum ſinus totius, nimirum re
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ctãgulum ſub DX, XA, ad re-
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ctangulum ſub AV,
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Y, ſinubus
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rectis arcuum AB, AC, vt eſt
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DZ, ſinus verſus arcus DL, ſiue anguli A, ad
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T, differentiam ſinuum verſo-
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rum BR, BQ, arcuum BC, BK: </
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<
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">ſi tamen triangula XAV,
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T, oſtenda-
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mus æquiangula eſſe, vtin ſeptimo caſu.</
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<
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maior etiam quadrante. </
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tibus AL, BM, ex AC, BC, reliqua conſtruantur, vt in primo caſu. </
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vtibi, ita hic demonſtrabitur, ita
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eſſe quadratum ſinus totius, re-
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ctangulum videlicet ſub DX,
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XA, ad rectangulum ſub AV,
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Y, ſinubus rectis arcuum AB,
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AC, vt eſt DZ, ſinus verſus ar-
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cus DL, ſiue anguli A, ad
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T,
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differentiam ſinuum verſorum
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BR, BQ arcuum BC,
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. </
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triangula XAV,
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T, eſſe æ-
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quiangula, ita confirmabitur.
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ST, angulo ISR, æqualis eſt. </
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<
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SIR, & </
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T, SIR, æquales erunt; </
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<
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rectangulis
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T, IXY, reliqui quoque anguli
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ST, IXY, hoc eſt, AXV,
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(cum hic ipſi IXY, ſit æqualis) inter ſe æquales erunt. </
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li
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T, XAV, in triangulis rectangulis
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T, XAV, erunt æquales.</
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<
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quadrante, & </
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BC, quadrante minor. </
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<
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to circulo ABGF, abſciſſoq́ue
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quadrante AL, ex AC, & </
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<
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ducto BC, vt fiat quadrans BM,
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deſcribãtur ex polis A, B, ad in-
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terualla quadrantum AL, BM,
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circuli maximi BLEF, AEMG,
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incedetq́; </
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pterea quòd maximus circulus à polo abeſt quadrante maximi circuli. </
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