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

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CONICORUM LIBER II. 235<br />

XXIII.<br />

Si in oppositis coniugatis e centro recta ad quamuis<br />

sectionum ducitur, eique parallela recta ducitur <strong>cum</strong><br />

tribus sectionibus deinceps<br />

\Ur „ positis concurrenS; rectangulum<br />

comprehensum partibus<br />

rectae ductae inter<br />

tres sectiones ortis duplo<br />

maius est quadrato radii.<br />

sint Aj B, Fj z/ sectiones<br />

oppositae coniugatae,<br />

centrum autem sectionum<br />

sit Xy ei a X ad quamuis<br />

sectionum adcidat recta aliqua<br />

rXj rectaeque FX<br />

parallela ducatur KA tres sectiones deinceps positas<br />

secans. dico, esse KMx MA = 2rxl<br />

ducantur asymptotae sectionum EZ, H®\ itaque<br />

rX2 = 0MxME[prop.XXII] = 02^XiiC£;[prop.XI].<br />

est autem @M X ME + @Kx KE = AM X MK<br />

[u. Eutocius], quia extrema aequalia sunt [prop. VIII<br />

et XVI]. ergo etiam AMxMK = FX^<br />

XXIV.<br />

Si <strong>cum</strong> parabola duae rectae concurrunt singulae<br />

in binis punctis, neutriusque earum punctum coneursus<br />

punctis concursus alterius continetur, rectae inter se<br />

extra sectionem concurrent.<br />

sit parabola ABVJj et <strong>cum</strong> ABFA duae rectae<br />

concurrant AB, Fz/, neutriusque earum punctum

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