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Apollonii Pergaei quae graece exstant cum ... - Wilbourhall.org

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EUTOCII COMMENTARIA IN CONICA. 217<br />

uertendum est, diametrum sectionis in parabola<br />

alterum latus trianguli basimque secare, in hyperbola<br />

autem et latus et rectam in altero latere ad uerticem<br />

uersus producto positam, in ellipsi autem et utramque<br />

latus et basim. decimam uero, qui obiter intuitus<br />

erit, fortasse eandem ac secundam esse putauerit; sed<br />

minime ita est; illic enim duo puncta in tota superficie<br />

sumi posse dicebat, hic uero in linea orta. in<br />

tribus autem deinde sequentibus propositionibus unamquamque<br />

harum sectionum diligentius distiuguit proprietates<br />

simul principales earum indicans.<br />

Ad prop. XI.<br />

Fiat Br^:BAxAr=®Z:ZA [I p. 38, 24—25]:<br />

manifestum quidem, quod dicitur, nisi si quis admoneri<br />

O TL Z<br />

^elit. sit<br />

onxnp = BAxAr,<br />

et spatium quadrato BF'^<br />

aequale ad IIP adplicatum<br />

latitudinem efficiat 7727, fiatque<br />

077 : nZ = AZ : Z@;<br />

® Z A itaque effectum est, quod<br />

<strong>quae</strong>ritur. nam quoniam est OTL: IIZ == AZ : Z&^<br />

e contrario erit [Eucl. V, 7 coroll.]<br />

est<br />

autem<br />

Zn:nO==®Z:ZA.<br />

Zn:nO = ZP: PO [Eucl. YI, 1] = BF^ :<br />

BA X AR<br />

hoc etiam in duabus, <strong>quae</strong> sequuntur, propositionibus<br />

[I p. 44,11; 50,6] utile est.<br />

O e corr. W. Un] Z e corr. W. 23. PO'] O e corr. W.<br />

tovzEGxiv W. £r] JB e corr. p.

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