Huygens, Christiaan, Christiani Hugenii opera varia; Bd. 2: Opera geometrica. Opera astronomica. Varia de optica

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[41.] Theor. XII. Prop. XV.
Page: 91 (376)
[42.] Theor. XIII. Prop. XVI.
Page: 95 (377)
[43.] Theorema XIV. Propos. XVII.
Page: 96 (378)
[44.] Theor. XV. Propos. XVIII.
Page: 98 (380)
[45.] Theor. XVI. Propos. XIX.
Page: 100 (382)
[46.] Problema IV. Propos. XX.
Page: 102 (384)
[47.] Christiani Hugenii C. F. ILLVSTRIVM QVORVNDAM PROBLEMATVM CONSTRVCTIONES. Probl. I. Datam ſphæram plano ſecare, ut portiones inter ſe rationem habeant datam.
Page: 109
[48.] LEMMA.
Page: 111 (390)
[49.] Probl. II. Cubum invenire dati cubi duplum.
Page: 112 (391)
[50.] Probl. III. Datis duabus rectis duas medias propor-tionales invenire.
Page: 114 (393)
[51.] ALITER.
Page: 115 (394)
[52.] ALITER.
Page: 116 (395)
[53.] Probl. IV.
Page: 117 (396)
[54.] Probl. V.
Page: 118 (397)
[55.] Probl. VI.
Page: 118 (397)
[56.] Probl. VII.
Page: 123 (399)
[57.] Utrumque præcedentium Aliter.
Page: 125 (401)
[58.] Probl. VIII. In Conchoide linea invenire confinia flexus contrarii.
Page: 127 (403)
[59.] FINIS.
Page: 128 (404)
[60.] DE CIRCULI ET HYPERBOLÆ QUADRATURA CONTROVERSIA.
Page: 132
[61.] VERA CIRCULI ET HYPERBOLÆ QUADRATURA AUTHORE JACOBO GREGORIO. LECTORI GEOMETRÆ SALUTEM.
Page: 134
[62.] DEFINITIONES.
Page: 139
[63.] PETITIONES.
Page: 141 (414)
[64.] VERA CIRCULI ET HYPERBOLÆ QUADRATURA.
Page: 142 (415)
[65.] PROP. I. THEOREMA. Dico trapezium B A P I eſſe medium propor-tionale inter trapezium B A P F, & triangulum B A P.
Page: 142 (415)
[66.] PROP. II. THEOREMA. Dico trapezia A B F P, A B I P ſimul, eſſe ad du- plum trapezii A B I P, ſicut trapezium A B F P ad polygonum A B D L P.
Page: 143 (416)
[67.] PROP. III. THEOREMA. Dico triangulum B A P, & trapezium A B I P ſimul, eſſe ad trapezium A B I P, ut duplum trapezii A B I P ad polygonum A B D L P.
Page: 144 (417)
[68.] PROP. IV. THEOREMA. Dico polygonum A B E I O P eſſe medium pro- portionale inter polygonum A B D L P & trapezium A B I P.
Page: 144 (417)
[69.] PROP. V. THEOREMA.
Page: 145 (418)
[70.] SCHOLIUM.
Page: 146 (419)
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17317HYPERB. ELLIPS. ET CIRC.
Data ſit portio A B C & triangulus D E F, baſibus A C,
11TAB. XXXIV
Fig, 2. D F æqualibus; & portionis diameter ſit B G, in trian-
gulo verò ducta à vertice in mediam baſin linea E H. Sint
autem utræque B G, E H vel ad baſes rectæ vel æqualiter
inclinatæ; & quam rationem habet B G ad E H, in eandem
dividatur ſpatium datum, ſintque partes K & L. Circumſcri-
batur jam ſicut antea portioni A B C figura ordinatè, quæ
portionem ſuperet exceſſu minore quàm ſit ſpatium K. Et
triangulo D E F circumſcribatur figura quæ totidem paral-
lelogrammis conſtet, quot ſunt in figura portioni A B C cir-
cumſcripta.
Quoniam igitur baſes portionis & trianguli æquales ſunt,
apparet quidem omnium parallelogrammorum eandem fore
latitudinem. Hinc quum parallelogrammum B M ſit ad E R
ut B G ad E H, id eſt ut K ad L, ſitque B M minus quam
K , erit quoque E R minus quam L . Verùm omnia 22Ex conſit.3314. 5.
Elem. gula quibus conſtat exceſſus figuræ circumſcriptæ ſupra trian-
gulum D E F, æqualia ſunt parallelogrammo E R, ergo
minor eſt idem exceſſus ſpatio L. Sed & exceſſus quo figu-
ra circumſcripta portionem A B C ſuperat, minor eſt ſpa-
tio K. Ergo utergue ſimul exceſſus minor erit ſpatio K L
dato. Et conſtat fieri poſſe quod proponebatur.
Theorema III.
SI portioni hyperboles, vel ellipſis vel circuli por-
tioni, dimidiâ ellipſi dimidiove circulo non majori,
circumſcribatur figur a or dinatè; ejus figuræ centrum
gravitatis erit in portionis diametro.
Sit portio quælibet iſtarum A B C, diameter ejus B D;
44TAB. XXXVI.
Fig. 3.& circumſcribatur ei ut ſupra figura ordinatè. Oſtenden-
dum eſt ejus figuræ centrum gravitatis fore in B D diametro.
Ducantur lineæ H K, N R, P S, conjungentes ſuprema
latera parallelogrammorum quæ à diametro portionis æqua-
liter utrinque diſtant.

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