user-avatar
phu8451
2 năm trước
Trên đường thẳng A A'. Lấy điểm O trên một nửa mặt phẳng bờ A A'. Vẽ tia Ob góc AOB = 45 độ. Trên mặt phẳng bờ còn lại vẽ tia Oc sao cho goác AOC = 90 độ a) Góc OB' là tia phân giác của góc A'OC. Chứng tỏ rằng AOB và AOB' là hai góc đối đỉnh b) Trên nửa mặt phẳng bờ A A' có chứa tia Ob sao cho góc AOB = 90 độ. Tính góc A'OD
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

My village is about 10 kilometers (1)…………….the city. It is a very beautiful and peaceful place where people grow flowers and vegetables only. It is very famous (2) ……………. its pretty roses and beautiful landscapes. The air is quite fresh, (3)………………the smell of the roses makes people feel cool. In spring, my village looks like a carpet with plenty of colors. Tourists come to visit it so (4)………………. Nowadays, with electricity, it doesn’t take the villagers much time to (5)……………the roses. And even at night, people can walk along the path and enjoy the fresh smell of the flowers. From - often - however - Peaceful - water - flower - for 1. My village is about 10 kilometers (1)…………….the city. 2. It is very famous (2) ……………. its pretty roses and beautiful landscapes. 3. The air is quite fresh, (3)………………the smell of the roses makes people feel cool. 4. Tourists come to visit it so (4)………………. 5. Nowadays, with electricity, it doesn’t take the villagers much time to (5)……………the roses.

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team