题目内容
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P, Q, and R are three points in a plane, and R does not lie on line PQ. Which of the following is true about the set of all points in the plane that are the same distance from all three points?
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AIt contains no points.
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BIt contains one point.
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CIt contains two points.
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DIt is a line.
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EIt is a circle.
B显示答案