Cho tam giác ABC ( AB<AC). Trên tia AC lấy điểm M sao cho AM = AB. Gọi I là trung điểm của BM . a) chứng minh góc BAI = góc MAI b) tia AI cắt BC tại D, chứng minh tam giác BAD=MAD c) Qua D kẻ DE // AB ( E thuộc AC). Vẽ EF là tia phân giác của góc DEC ( F thuộc DC). Chứng minh rằng EF // AD d) Vẽ tia Ax là tia đối của AB, Ay là tia phân giác của góc xAC, EK vuông góc với Ay tại K. Chứng minh rằng : 3 điểm K , E, F thẳng hàng

Các câu hỏi liên quan

Exercise 2: Complete the sentences with the correct form of words If you___________(find) a wallet in the street, what would you do with it? I must hurry. My friend____________(be) annoyed if I___________(not/be) on time. If I________(be) a bird, I_____________(not/want) to live my whole life in a cage. I didn’t realize that Gary was in the hospital. If I____________(know) he was in hospital, I___________(go) to visit. If you_____________(pour) oil on water, it_____________(float) If the phone____________(ring), can you answer it? If I______________(have) wings, I______________(not/have to) take an airplane to fly home. A: What will we do tomorrow? B: Well, if it___________(be) a nice day, we____________(go) to the beach. A: You look tired. B: If you_____________(not/wake) me up in the middle of the night, I__________(not/be) tired. This soup isn’t very good. it____________(taste)better if it___________(not/be) so salty. Unfortunately, I didn’t have my address book with me when I was in New York. If I___________(have) your address, I____________(send) you a postcard. I think there are many cars. If there_____________(not/be) so many cars, there___________(not/be) so much pollution. The accident was your fault. If you___________(drive) more carefully, it_____________ (not/happen). People___________(be) able to fly if they____________(have) feathers instead of hair. Last night Alex ruined his sweater when he washed it. If he___________(read) the label, he______________(not/wash) it in hot water. Mn giúp em và giải thích nha