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

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

Table of contents

[21.] CHRISTIANI HUGENII, Const. F. AD C. V. FRAN. XAVERIUM AINSCOM. S. I. EPISTOLA. Cl. Viro D°. XAVERIO AINSCOM CHRISTIANUS HUGENIUS S. D.

[22.] CHRISTIANI HUGENII, Const. F. DE CIRCULI MAGNITUDINE INVENTA. ACCEDUNT EJUSDEM Problematum quorundam illuſtrium Conſtructiones.

[23.] PRÆFATIO.

[24.] CHRISTIANI HUGENII, Const. f. DE CIRCULI MAGNITUDINE INVENTA. Theorema I. Propositio I.

[25.] Theor. II. Prop. II.

[26.] Theor. III. Prop. III.

[27.] Theor. IV. Prop. IV.

[28.] Theor. V. Prop. V.

[29.] Theor. VI. Prop. VI.

[30.] Theor. VII. Prop. VII.

[31.] Theor. VIII. Prop. VIII.

[32.] Theor. IX. Prop. IX.

[33.] Problema I. Prop. X. Peripheriæ ad diametrum rationem invenire quamlibet veræ propinquam.

[34.] Problema II. Prop. XI.

[35.] Aliter.

[36.] Aliter.

[37.] Problbma III. Prop. XII. Dato arcui cuicunque rectam æqualem ſumere.

[38.] Theor. X. Prop. XIII.

[39.] Lemma.

[40.] Theor. XI. Prop. XIV.

[41.] Theor. XII. Prop. XV.

[42.] Theor. XIII. Prop. XVI.

[43.] Theorema XIV. Propos. XVII.

[44.] Theor. XV. Propos. XVIII.

[45.] Theor. XVI. Propos. XIX.

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[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.

[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)

145418VERA CIRCULI proportionalia, & ex prædictis ſatis facile colligi poteſt
trapezium A I L P eſſe dimidium polygoni A B D L P &
trapezium A I O P eſſe dimidium polygoni A B E I O P
& triangulum A I P eſſe dimidium trapezii A B I P: &
proinde terminos duplicando, polygonum A B D L P, po-
lygonum A B E I O P & trapezium A B I P ſunt continuè
proportionalia, quod demonſtrare oportuit.

Ducantur rectæ C G, K N, ſegmentum tangentes in
punctis E, O, & rectis D L, D B, L P, occurrentes in
punctis C, G, K, N, ut compleatur polygonum
A B C G K N P.

PROP. V. THEOREMA.

Dico trapezium A B I P & polygonum A B E I O P
11TAB. XLIII.
Fig. 1. 2. 3. ſimul, eße ad polygonum A B E I O P, ut
duplum polygoni A B E I O P ad poly-
gonum A B C G K N P.

Ex hujus tertia manifeſtum eſt triangulum A B I & tra-
pezium A B E I ſimul, eſſe ad trapezium A B E I,
ut duplum trapezii A B E Iad polygonum A B C G I: &
ex prædictis facile concludi poteſt triangulum A B I eſſe di-
midium trapezii A B I P, & trapezium A B E I eſſe dimi-
dium polygoni A B E I O P, & polygonum A B C G I
eſſe dimidium polygoni A B C G K N P; & proinde termi-
nos duplicando, trapezium A B I P & polygonum A B E I O P
ſimul, erunt ad polygonum A B E I O P ut duplum polygo-
ni A B E I O P ad polygonum A B C G K N P, quod
demonſtrandum erat.

Hinc facile colligi poteſt polygonum A B C G K N P
eſſe medium harmonicum inter polygona A B E I O P,
A B D L P, quod hic admonuiſſe ſufficiat, in ſequentibus
enim demonſtrabitur.

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