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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