Trong hình chữ nhật ABCD ở hình bên, hãy dự đoán O là trung điểm của những đoạn thẳng nào? Em hãy nêu cách kiểm tra dự đoán đó.

Các câu hỏi liên quan

1. If she doesn’t hurry, she’ll be late. ……………………………………………………………… 2. If we had more rain, our crops would be better. ………………………………………………… 3. If you don’t like this one, I will bring you another. ……………………………………………… 4. If you are not careful, you will cut yourself with that knife. ………………………………………………………………………………………………………… 5. I’ll be able to do any work if I do now have a quiet room. ………………………………………………………………………………………………………… 6. The flood would have been ruined if the flood had risen higher. …………………………………………………………………………………………………… 7. If you hadn’t sneezed, he wouldn’t have known that we were there. …………………………………………………………………………………………………… 8. If she did her hair differently, she would look quite nice. …………………………………………………………………………………………………… 9. If John had played for our football team, we would not have lost the game. …………………………………………………………………………………………………… 10. If I won the first prize in a lottery, I’d give up my job.