The radius of a circle is 10. The area of the sector(fan-shaped) whose center angle is x is A. Which of the following formulas can express A in terms of x?
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AA=\frac{πx}{18}
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BA=\frac{πx}{9}
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CA=\frac{πx}{6}
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DA=\frac{2πx}{9}
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EA=\frac{5πx}{18}
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正确答案: E