2. 外语
  3. In the figure above, the area of the circular region with center O is 16π, if AB=AC, what is the length of AB?

In the figure above, the area of the circular region with center O is 16π, if AB=AC, what is the length of AB?

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问题 In the figure above, the area of the circular region with center O is 16π, if AB=AC, what is the length of AB?
选项 A、8
B、4
C、
D、2π
E、无法计算
答案C
解析 πr2=16π，所以r=4，由于∠BAC=90°，所以BC为圆的直径，BC=8，AB=，因此C为正确答案。
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