user-avatar
Nhudatnhuquan@gmail.com
2 năm trước
Bài 4 P1: (3 điểm) Cho tam giác ABC cân tại A, kẻ AH vuông góc với BC (H thuộc BC). Kẻ HD, HE lần lượt vuông góc với AB và AC (D thuộc AB, E thuộc AC). Trên tia đối của tia DH lấy điểm M; trên tia đối của tia EH lấy điểm N sao cho DM = DH; EN = EH. a) Chứng minh tam giác ABH = ACH ; b) Chứng minh tam giác AMN là tam giác cân, từ đó suy ra góc BAC = 1/2 góc MAN c) Chứng minh MN//DE. d) Cho AB = 5cm, BC = 6cm. Tính độ dài BD.
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

NHÌN DÀI NHƯNG NGẮN LẮM II. Give the correct form of the verbs in brackets to complete the following sentences. 1. No one enjoy (go) ……….to hospital. 2. What you (do)…………at the moment? I (watch) ………….T.V. 3. We (be) ……………students in four years. 4. A new school (build) ………………near our school now. 5. You (be) …………..angry if he refuses to help you? 6. I will send him the message as soon as he (return)……………… 7. A lttle girl can’t spend all her time (listen) ……………..to stories. 8. He sent a telegram for his mother (learn) …………….good news. 9. + Where are you? + I am upstairs. I (have)……………… a bath. III. Fill in each blank with the correct form of the word given in capital: 1. My father has a …………computer. He often brings it with him when he’s away on business. PORT 2. We are all ………..about going on an excursion to Cuc Phuong forest next weekend. EXCITE 3. The room will look brighter if there is a …………..on the wall. PAINT 4. Some of the children …………….boys, play marbles when there is a break. MAIN 5. You shouldn’t eat ……….food. HEALTH 6. We mustn’t be ……………….when we cross busy streets. CARE 7. She often feels …………………when she gets bad marks. HAPPY 8. There are about 200 ………….in this company. EMPLOY 9. Mai is ………….at math than me. GOOD 10. This lovely apartment has two bedrooms and it is ……………FURNISH IV. Choose the underline word or phrase that is incorrect 1. Tim is at the same age as Hoa. A B C D 2. At recess, the students practice to play basketball. A B C D 3. Do you know how much a banana cost? A B C D 4. The tacher says Ba will be a famous artist in one day. A B C D 5. Some boys are playing marble in the school yard at recess. A B C D 6. Some students are playing games as blind man’s buff and catch. A B C D 7. Mai learns how to use a computer in her scientific class. A B C D 8. I’d love coming to your birthday but I’m much too busy. A B C D 9. There are less TV programs for teenagers than there are for adults. A B C D 10. People are living longer so there are more and more many old people A B C D V. Fill in the blanks with the correct prepositions.( điền giới từ vào chỗ trống) 1. What time does the library close? - It closes …………about half …………four. 2. Can you help me wash …………these dirty glasses? 3. We look ………………..the new words in the dictionary. 4. You shouldn’t eat and watch TV ……….the same time. 5. These cards are in alphabetical order and …………author. 6. Schools in Vietnam are different ……….those in the USA. 7. What is your date ………birth? - November eighth. 8. Farmers are very hard-working. They work from morning ………night on their farms. 9. I like to live ……….the countryside because people there are more friendly. 10. Mr. Minh is not at home now. He is …………work.

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