CÂU 1: Khằng định nào trong các khẳng định sau đây là đúng ? * 1 điểm Số đo của góc có đỉnh ở bên trong đường tròn bằng nửa hiệu số đo của 2 cung bị chắn. Số đo của góc có đỉnh ở bên ngoài đường tròn bằng nửa tổng số đo của 2 cung bị chắn. Số đo của góc có đỉnh ở bên trong đường tròn bằng nửa tổng số đo của 2 cung bị chắn. Số đo của góc nội tiếp bằng số đo của cung bị chắn

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