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haianh123
2 năm trước
Cho đường tròn (O), đường kính AB=10cm. Gọi H là một điểm thuộc bán kính OA. Kẻ dây CD đi qua H và vuông góc với OA. a) tính diện tích tứ giác ACBD, biết OH=3cm
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