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【OG20-P275-261题】
What is the circumference of circle C?(1)The radius of circle C is 2Π (2)The center of circle C is located at point (7, 8)in the xy-plane
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周长C=2πr
条件1:半径r=2π,充分
条件2:圆心坐标无关,不充分
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