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?
~$\frac{5}{12}$~
~$\frac{2}{5}$~
~$\frac{1}{2}$~
~$\frac{3}{4}$~
~$\frac{5}{6}$~
粗心,重算就对了
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