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Si rectae datae AR, BR cum arcu AB, chorda AB & tangente AD, triangula tria ARB, ARB, ARD constituunt, dein puncta A, B accedunt ad invicem: dico quod ultima forma triangulorum evanescentium est similitudinis, & ultima ratio aequalitatis.
Nam producantur AB, AD, AR ad b, d & r. Ipsi RD agatur parallela rbd, & arcui AB similis ducatur arcus Ab. Coeuntibus punctis A, B, angulus bAd
Corol. Et hinc triangula illa in omni de rationibus ultimis argumentatione pro se invicem usurpari possunt.