One property of a planar curve whose convex hull covers a given convex figure

In this note, we prove the following conjecture by A. Akopyan and V. Vysotsky: If the convex hull of a planar curve $γ$ covers a planar convex figure $K$, then $\operatorname{length}(γ) \geq \operatorname{per} (K) - \operatorname{diam} (K)$. In addition, all cases of equality in this inequality are studied.

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