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thuylinh.18.02.2001
2 năm trước
Cho góc bẹt AOB. Trên cùng một nửa mặt phẳng bờ AB vẽ các tia OC và OD sao cho 𝐴̂𝑂𝐶 = 60 độ; 𝐵̂𝑂𝐷 =1/2 𝐴̂𝑂𝐶. Chứng minh rằng hai tia OC và OD vuông góc với nhau
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