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Omni-MATH / A convex figure F is such that any equilateral triangle with side 1 has a parallel translation that takes all its vertices to the boundary of F. Is F necessarily a circle?

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problem

A convex figure FF is such that any equilateral triangle with side 11 has a parallel translation that takes all its vertices to the boundary of FF. Is FF necessarily a circle?
Plain-text mathematical notation (without MathML)
A convex figure F is such that any equilateral triangle with side 1 has a parallel translation that takes all its vertices to the boundary of F. Is F necessarily a circle?
Original LaTeX notation
A convex figure $F$ is such that any equilateral triangle with side $1$ has a parallel translation that takes all its vertices to the boundary of $F$. Is $F$ necessarily a circle?

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