user-avatar
nguyenvyvy2k2
2 năm trước
Cho tam giác cân tại A, góc A= 108°. Gọi O là giao điểm của các đường trung trực, I là giao điểm của các tia phân giác. Chứng minh rằng BC là đường trung trực OI
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

XI – Complete the sentences with must or have/has to. 1. Vietnamese children______ wear uniform when they go to school. 2. Last night my sister was ill. We______ call the doctor. 3. I have bad toothache. I______ make an appointment with the dentist. 4. I don’t want to______ wait in a queue for ages. 5. She______ work on Saturday morning. 6. When you come to California, you______ come and see us soon. 7. This is a terrible party. We______ go home. 8. If there are no taxis we’ll______ walk. 9. Daniel______ go to the bank. He hasn’t any money. 10. You really______ hurry up, Vicky. We don’t want to be late. XII – Fill in the blanks with mustn’t or don’t/doesn’t have to. 1. They______ work on Saturday. 2. Visitors______ feed the animal. 3. Tim______ wear uniform at school. 4. You touch that switch. It’s very dangerous. 5. Don’t make so much noise. We______ wake the baby. 6. Staff______ smoke when serving customers. 7. There’s a lift in the building, so I______ climb the stairs. 8. Sally is extremely rich. She______ work. 9. I don’t want anyone to know about our plan. You______ tell anyone. 10. You______ be a good player to enjoy a game of tennis

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