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xumint87
2 năm trước
Bài 5: Cho góc vuông AOB, hai tia OC, OD ở trong góc đó sao cho . Trên nửa mặt phẳng bờ OA chưa OB, vẽ tia OE sao cho tia OB là phân giác của góc DOE. a) Hai tia OC, OD là phân giác của những góc nào? b) Chứng minh OC vuông góc với OE.
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