Theodosius <Bithynius>; Clavius, Christoph
,
Theodosii Tripolitae Sphaericorum libri tres
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totus ad datum latus recto angulo oppoſitum; </
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<
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">vel vt ſinus anguli acuti
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dato lateri circa rectum angulum oppoſiti ad datum latus circa angulum
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rectum, ita ſinus alterius anguli acuti ad aliud, cognoſcetur tertium latus
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in partibus menſuræ, ſec@ndum quam duo latera ſunt data.</
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<
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">ALITER. </
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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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">AB, palm. </
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<
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<
s
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">Quia igitur, ut ad
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">Aliter per li
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neas tangẽ-
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tes & ſecan-
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tes.</
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initium lincarum tangentium, ac ſecantium oſtendimus, poſito AB, ſinu toto
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latus AC, ſecans eſt anguli A, & </
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<
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">BC, tãgens eiuſdem; </
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<
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</
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<
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<
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">dat AB, ſinum totum partium 100000 quid dabit AC, palm. </
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<
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musq́; </
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<
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">ſecantem AC, partium 260000. </
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<
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">ut hic patet.</
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AB. # AB. # AC. # # AC.
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5. # 100000. # 13? # fit # 260000.
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<
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">Ex tabula ergo Secantium erit angulus A, grad 67. </
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<
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quus angulus C, grad. </
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">tangens anguli A, nempe BC, da-
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bitur partium 240038. </
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<
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">ex tangentium tabula. </
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<
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">Quare rurſum dicemus. </
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<
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">Si ſinus
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totus AB, partium 100000. </
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<
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">dat AB, palm. </
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<
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<
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tium 260000. </
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<
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">dat AC, palm. </
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<
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<
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<
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ueniemusque iterum BC, eſſe ferme palm. </
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<
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<
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AB. # AB.
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100000. # 5.
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AC. # AC.} # BC. # # BC.
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260000. # 13. # 240038? # fit. # 12.
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latere circa angulum rectum; </
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<
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">Si fiat, vt datum latus circa angulum re-
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ctum ad ſinum totum, ita datum latus angulo recto oppoſitum ad aliud,
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prodibit ſecans anguli acuti ſub datis lateribus comprehenſi. </
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<
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go, beneficio huius ſecantis repertæ, vtroque angulo acuto, & </
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ti anguli ſub datis lateribus comprehenſi, ex tarigentiũ tabula; </
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<
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fiat, vt ſinus totus ad datum latus circa angulum rectum; </
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<
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">Vel vt ſecans
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acuti anguli ſub datis lateribus comprehenſi ad latus datum recto angu-
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lo oppoſitum, ita tangens acuti anguli ſub lateribus datis comprehenſi ad
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aliud, notum fiet tertium latus in partibus menſuræ, ſecundum quam ſunt
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data duo latera. </
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<
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">Verum ſatius eſt per ſolos ſinus operari, cum tangentes
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lineæ, at que ſecantes nihil compendij afferant, ſintque per ſinus inuentæ.</
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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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ergo quadratum rectæ AC, duobus quadratis rectarum AB, BC, æquale
<
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<
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xlink:label
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eſi; </
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<
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">ſi auferatur quadratum lateris AB, quod eſt 25. </
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<
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quod eſt 169 relinquetur quadratũ lateris BC, nempe 144. </
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<
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diata 12. </
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<
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<
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<
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">Et quia, poſito AC, ſinu toto, latera AB,
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BC, ſunt ſinus angulorum oppoſitorum, ut in defin. </
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<
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</
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<
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">Sifiat, ut latus AC, angulo recto oppoſitum palmorum 13. </
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<
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">ad AC, ſinum
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totum partium 100000. </
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<
s
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">ita alterutrum laterum circa angulum rectum, nempe
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BC, palm. </
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<
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">12. </
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<
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">ad aliud, prodibit ſinus anguli acuti A, ſumpto lateri oppoſiti
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partium 92308. </
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<
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">Ex ſinuum ergo tabula dabitur angulus A, grad. </
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<
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">67. </
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<
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