Question: From a 12x18 cm rectangular board, circles are cut, as seen in the figures, the small ones are equal to each other, the same as

From a 12x18 cm rectangular board, circles are cut, as seen in the figures, the small ones are equal to each other, the same as the large ones. Furthermore, the radius of a small circle is half the radius of a large circle. What is the area of what is left on the board?

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