Inscribed and circumscribed circles to convex curves

Zamfirescu, Tudor

doi:10.1090/S0002-9939-1980-0581004-2

Inscribed and circumscribed circles to convex curves
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by Tudor Zamfirescu

Proc. Amer. Math. Soc. 80 (1980), 455-457

DOI: https://doi.org/10.1090/S0002-9939-1980-0581004-2

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Abstract:

A convex planar curve may have $2,3, \ldots ,\mathfrak {c}$ contact points with its inscribed or circumscribed circle. One of these numbers appears in most cases: 3.

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