Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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rallelogramma inter ſe ut partes, ſummæ partium ſemper erunt ut
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ſummæ parallelogrammorum; atque adeo, ubi partium & paralle
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logrammorum numerus augetur & magnitudo diminuitur in infiNI
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tum, in ultima ratione parallelogrammi ad parallelogrammum, id
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eſt (per hypotheſin) in ultima ratione partis ad partem. </
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LEMMA V.
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Similium Figurarum latera omnia, quæ ſibi mutuo reſpondent, ſunt
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proportionalia, tam curvilinea quam rectilinea; & areæ ſunt in
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duplicata ratione laterum.
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LEMMA VI.
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Si arcus quilibet poſitione datus
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AB
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ſub-
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tendatur chorda
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AB,
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& in puncto
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aliquo
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A,
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in medio curvaturæ continuæ,
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tangatur a recta utrinque producta
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AD;
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dein puncta
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A, B
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ad invicem
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accedant & coëant; dico quod angulus
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BAD,
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ſub chorda & tangente conten
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tus, minuetur in infinitum & ultimo e
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vaneſcet.
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>Nam ſi angulus ille non evaneſcit, continebit arcus
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AB
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cum tan
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gente
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AD
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angulum rectilineo æqualem, & propterea curvatura ad
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ad punctum
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A
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non erit continua, contra hypotheſin. </
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LEMMA VII.
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Iiſdem poſitis; dico quod ultima ratio arcus, chordæ, & tangentis
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ad invicem est ratio æqualitatis.
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<
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>Nam dum punctum
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B
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ad punctum
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A
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accedit, intelligantur ſemper
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AB
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&
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AD
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ad puncta longinqua
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b
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ac
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d
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produci, & ſecanti
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BD
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parallela agatur
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bd.
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Sitque arcus
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Ab
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ſemper ſimilis arcui
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AB.
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Et punctis
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A, B
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coeuntibus, angulus
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dAb,
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per Lemma ſuperius,
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evaneſcet; adeoque rectæ ſemper ſinitæ
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Ab, Ad
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& arcus interme
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dius
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Ab
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coincident, & propterea æquales erunt. </
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<
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ſemper proportionales rectæ
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AB, AD,
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& arcus intermedius
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AB
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