cho tam giác abc vuông ở A.Kẻ AH vuông góc BC.Kẻ HE vuông góc AB.Kẻ HF vuông góc AC a,Chứng minh AH=EF b, Gọi M,N thứ tự là trung điểm của HB, HC.Hỏi EFNM là hình gì? Vì sao Chỉ cần giải câu b

Các câu hỏi liên quan

III. Give the correct form of verbs in brackets in future simple tense, then rewrite these sentences into negative and interrogative 1. The film ________________________ (end) at 10:30 pm. Negative____________________________________________________________ Interrogative ________________________________________________________ 2. David________________________ (earn) a lot of money. Negative____________________________________________________________ Interrogative ________________________________________________________ 3. Mark________________________ (travel) around the world. Negative____________________________________________________________ Interrogative ________________________________________________________ 4. Peter ________________________ (meet) lots of interesting people. Negative____________________________________________________________ Interrogative ________________________________________________________ 5. They ________________________ (do) it for you tomorrow. Negative____________________________________________________________ Interrogative ________________________________________________________ 6. My father ________________________ (call) you in 5 minutes. Negative____________________________________________________________ Interrogative ________________________________________________________8 7. He _____________________ (be) 21 on his next birthday. Negative____________________________________________________________ Interrogative ________________________________________________________ 8. They ________________________ (come) at 8 o'clock. Negative____________________________________________________________ Interrogative ________________________________________________________ 9. You ________________________ (call) me next week. Negative____________________________________________________________ Interrogative ________________________________________________________ 10. It ________________________ (rain) tomorrow. Negative____________________________________________________________ Interrogative ________________________________________________________ mong mọi người giúp ạ