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

[11.] Theorema III.

[12.] Theorema IV.

[13.] Lemma.

[14.] Theorema V.

[15.] Theorema VI.

[16.] Theorema VII.

[17.] Theorema VIII.

[18.] ἘΞἘΤΑΣΙΣ CYCLOMETRIÆ CLARISSIMI VIRI, GREGORII à S. VINCENTIO, S. J. Editæ Anno D. cIↄ Iↄc XLVII.

[19.] FINIS.

[20.] CHRISTIANI HUGENII, Const. F. AD C. V. FRAN. XAVERIUM AINSCOM. S.I. EPISTOLA, Qua diluuntur ea quibus Ε’ξε{τα}{σι}ς Cyclometriæ Gregorii à Sto. Vincentio impugnata fuit.

[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.

20320THEOR. DE QUADRAT. rantur duæ æquales E S, B P, & inſuper alia P D. Dico
iterum, id quo rectangulum E D B excedit E P B, æquari
rectangulo S D P. Rectangulum enim E D B æquale eſt iſtis
duobus, rectangulo E D P, & rectangulo ſub E D, P B;
horum autem E D P rurſus æquale eſt duobus, rectangulo ni-
mirum S D P, & ei quod continetur ſub E S, D P, ſive
rectangulo D P B. Igitur rectangulum E D B iſtis tribus æ-
quale eſt rectangulis, S D P, D P B, & rectangulo ſub
E D, P B; horum vero duo poſtrema æquantur rectangu-
lo E P B; ergo rectangulum E D B æquale eſt duobus, re-
ctangulo nimirum S D P & E P B, unde apparet exceſ-
ſum rectanguli E D B ſupra rectangulum E P B æquari re-
ctangulo S D P.

Theorema V.

DAtâ portione hyperboles, vel ellipſis vel cir-
culi portione, dimidiâ figurâ non majore; ſi ad
diametrum conſtituatur triangulus hujuſmodi, qui
verticem habeat in centro figuræ, & baſin portio-
nis baſi æqualem & parallelam; eam verò quæ de-
inceps à vertice ad mediam baſin pertingit tantam,
ut poſſit ipſa rectangulum comprehenſum lineis, quæ
inter portionis baſin & terminos diametri figuræ in-
terjiciuntur. Erit magnitudinis, quæ ex portione &
præſcripto triangulo componitur, centrum gravita-
tis punctum idem quod eſt trianguli vertex, cen-
trum nimirum figuræ.

Data ſit portio hyberboles, vel ellipſis vel circuli portio
11TAB. XXXV.
Fig. 1. 2. 3. dimidiâ figurâ non major, A B C. Diameter ejus ſit B D,
& figuræ diameter B E, in cujus medio centrum figuræ F.
Et ſumatur F G quæ poſſit rectangulum B D E, ductâque
K G H æquali & parallelâ baſi A C, quæque ad G

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