DelMonte, Guidubaldo
,
Mechanicorvm Liber
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uallo quidem vna ipſarum circulus deſcribatur DH kE, qui li
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neas CH CK ſecet in punctis OP; connectanturq; OB PB. </
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Quoniam igitur punctum k propius eſt ipſi E, quàm H; erit linea
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Ck maior ipſa CH, & CP ipſa CO minor: ergo PK ipſa OH
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maior erit. </
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<
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">Quoniam autem triangulum BkP æquicrure latera
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Bk BP lateribus BH BO trianguli BHO æquicruris æqualia ha
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bet, baſim verò KP baſi HO maiorem, erit angulus kBP an
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gulo
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HBO maior. </
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<
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id
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">ergo reliqui ad baſim anguli, hoc eſt kPB
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PkB ſimul ſumpti, qui inter ſe ſunt æquales, reliquis ad baſim an
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gulis, nempè OHB HOB, qui etiam inter ſe ſunt æquales, mino
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res
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erunt: cùm omnes anguli cuiuſcunq; trianguli duobus ſint rectis
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æquales. </
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">quare & horum dimidii, ſcilicet NkB minor MHB. </
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Cùm autem angulus BkG æqualis ſit angulo BHF, erit NkG
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ipſo MHF maior. </
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">ſi igitur à puncto k conſtituatur angulus GKQ
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ipſi FHM æqualis, fiet triangulum GkQ triangulo FHM æqua
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le; nam duo anguli ad FH vnius duobus ad Gk alterius ſunt
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æquales, & latus FH lateri Gk eſt æquale, erit GQ ipſi FM æ
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quale.
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</
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<
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">ergo GN maior erit ipſa FM. </
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<
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">Cùm itaq; BG ipſi BF ſit æqua
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lis, erit BN minor ipſa BM. </
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<
s
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">Quòd autem BM ſit ipſa BA minor,
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eſt manifeſtum; cùm BM ipſa BF, quæ ipſi BA eſt æqualis, ſit
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minor. </
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<
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">quod demonſtrare oportebat. </
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4
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Primi.
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8
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Tertii.
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25
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Primi.
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5
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Primi.
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26
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Primi.
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<
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">Inſuper ſi intra BG BE alia vtcunq; ducatur linea ipſi BG æ
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qualis; fiatq; operatio, quemadmodum ſupra dictum eſt; ſimili
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ter oſtendetur lineam BR minorem eſſe BN. </
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<
s
id
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id.2.1.95.1.1.1.0.a
">& quò propius fue
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rit ipſi BE, adhuc minorem ſemper eſſe. </
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