If A is the point (-4, 1) and B is the point (2, 1), what is the area of the circle which has AB as a diameter?

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问题 If A is the point (-4, 1) and B is the point (2, 1), what is the area of the circle which has AB as a diameter?

选项 A、3π
B、6π
C、9π
D、12π
E、36π

答案C

解析
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