2. 外语
  3. In the figure, O is the center of the circle and the area of the circle is 4π, what is the length of arc ABC?

In the figure, O is the center of the circle and the area of the circle is 4π, what is the length of arc ABC?

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问题 In the figure, O is the center of the circle and the area of the circle is 4π, what is the length of arc ABC?
选项 A、π
B、π/4
C、π/2
D、2π
E、无法计算
答案A
解析 πr2=4π，所以由arc ABC所对的圆心角为90°，因此：

所以arc ABC=π，A为正确答案。
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