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Câu 1: Đường tròn là hình A. không có trục đối xứng. B. có một trục đối xứng. C. có hai trục đối xứng. D. có vô số trục đối xứng. Câu 2: Đường tròn là hình A. có vô số tâm đối xứng. B. có hai tâm đối xứng. C. có một tâm đối xứng. D. chông có tâm đối xứng. Câu 3: Số điểm chung nhiều nhất giữa đường thẳng và đường tròn là A. 1. B. 2. C. 3. D. vô số điểm. Câu 4: Số điểm chung ít nhất của đường thẳng và đường tròn là A. 0. B. 1. C. 2. D. vô số điểm. Câu 5: Số đường tròn đi qua ba điểm không thẳng hàng là A. một đường tròn. B. hai đường tròn. C. vô số đường tròn. D. không có đường tròn nào.
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