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

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EUTOCII COMMENTARIA IN CONICA. 271<br />

efficiemus e casibus propositionis XLIII^ uelut in<br />

figura infra descripta puncto H extra E sumpto,<br />

quoniam est<br />

efc<br />

[prop. XLTII]<br />

AAF = ©HSl + £irM =0®r-\- OHM,<br />

Snr + AAHS = AAr= Snr-\- N&U propter<br />

ea, <strong>quae</strong> in prop. XLIII demonstrata sunt [u. supra<br />

p. 258, 2], erit etiam ^nr + N®n = Oer+ OMH<br />

auferatur, qui communis est, triangulus BOF] erit<br />

igitur, qui relinquitur, triangulus ^ON == HOM, et<br />

NS, MH parallelae suntj ergo NO == OH<br />

Ad prop. XLVIIL<br />

Huius quoque propositionis casus eodem modo se<br />

habent atque ii, quos in prop. XLVII in figura<br />

hyperbolae explicauimus.<br />

Ad prop. XLIX.<br />

Erit igitur KAN = JAUr. est autem<br />

L AAH = LKAN] itaque erit<br />

KAxAN=2A^XAr I p. 148, 3-6]<br />

seorsum enim describantur triangulus KAN et<br />

parallelogrammum AAUr. €i<br />

quoniam est KAN = ^U, per<br />

j„ N rectae AK parallela ducatur<br />

NP, per K autem rectae AN<br />

parallelaXP; parallelogrammum<br />

igitur est AP et = 2 KAN<br />

[EucL I, 34]; quare etiam AP=2An. iam AT, AH<br />

ad 2, T producantur, et ponatur FZ = AF,<br />

Figura est codicis W, nisi qiiod ibi ducta est ^P; pro JT<br />

liab. X; K corr. m. rec. ex M.

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