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