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trano1149
2 năm trước
Cho điểm I trong đường tròn tâm O hai dây cung AC và BD cùng đi qua điểm I sao cho IO là tia phân giác của góc AIB vẽ OH vuông góc với AC ở H ,OK vuông góc với BD tại K .chứng minh a,AC =BD b, sđ AD = sđ BC và chứng minh tứ giác ABCD là hình thang cân c,OI vuông góc với AB
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