A circular mat with diameter 20 inches is placed on a square tabletop, each of whose sides is 24 inches long. Which of the following is closest to the fraction of the tabletop covered by the mat?
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A$$\frac{5}{12}$$
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B$$\frac{2}{5}$$
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C$$\frac{1}{2}$$
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D$$\frac{3}{4}$$
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E$$\frac{5}{6}$$
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正确答案: C