2. Cho các hình sau đây: (1) Đoạn thẳng AB; (2) Tam giác đều ABC; (3) Hình tròn tâm O; (4) Hình thang cân ABCD (có đáy lớn CD); (5) Hình thoi ABCD. Trong các hình nói trên: a) Hình nào có trục đối xứng? Chỉ ra trục đối xứng của hình đó. b) Hình nào có tâm đối xứng? Chỉ ra tâm đối xứng của hình đó.

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