219
8[Figure 8]
circularis P M R, erit æqualis armillæ circulari
Hk O. Cum verò punctum L, ſumptum ſit arbi-
trariè, ſequitur omnes armillas differentiæ cono-
rum, æquales eſſe omnibus armillis differentiæ co-
noideorum. Ergo & differentia conorum erit æqua-
lis differentiæ conoideorum.
Hk O. Cum verò punctum L, ſumptum ſit arbi-
trariè, ſequitur omnes armillas differentiæ cono-
rum, æquales eſſe omnibus armillis differentiæ co-
noideorum. Ergo & differentia conorum erit æqua-
lis differentiæ conoideorum.
Sicuti autem probatum eſt totasillas differentias
æquales eſſe, ſic probari poteſt quaslibet ipſarum
partes proportionales item fore æquales. v. g. ſi in-
telligatur ductum planum H O, probari poteſt eo-
dem modo, partem differentiæ conoideorum
æquales eſſe, ſic probari poteſt quaslibet ipſarum
partes proportionales item fore æquales. v. g. ſi in-
telligatur ductum planum H O, probari poteſt eo-
dem modo, partem differentiæ conoideorum

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