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Mathematics, 30.11.2021 01:00 boos70
Six congruent circles form a ring with each circle externally tangent to the two circles adjacent to it. All six circles are internally tangent to a circle $\cal C$ with radius 30. Let $K$ be the area of the region inside $\cal C$ and outside all of the six circles in the ring. Find $\lfloor K\rfloor$. (The notation $\lfloor K\rfloor$ denotes the greatest integer that is less than or equal to $K$.)
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Six congruent circles form a ring with each circle externally tangent to the two circles adjacent to...
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