user-avatar
minhlanh111
2 năm trước
Cho tam giác ABC có AB=3cm, AC=4cm, BC= 5cm. a) Chứng minh tam giác ABC là tam giác cân. b) Vẽ BD là tia phân giác góc B ( D thuộc AC). Kẻ DE vuông góc với BC ( E thuộc BC). Chứng minh DE=DA. c) Tia ED cắt tia BA tại F. Chứng minh : hai tam giác : ADF và tam giác EDC bằng nhau? VẼ HÌNH VÀ NHANH NHANH MÌNH CẦN GẤP
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

I. Choose the word whose underlined part is pronounced differently from the others. 1. a. theater b. thank c. there d. thirty 2. a. gather b. bathe c. birthday d. weather 3. a. spare b. play c. game d. table 4. a. keep b. cheer c. meet d. week 5. a. swimming b. skipping c. driving d. fishing II. Circle the odd one out. 6. A. football B. tennis C. volleyball D. boxing 7. A. goggles B. courts C. skis D. skateboards 8. A. paddle B. ball C. bat D. racket 9. A. referee B. player C. coach D. stadium 10. A. career B. healthy C. sporty D. fit III. Choose the best answer a, b, c or d to complete the sentence. 11.Who wants to be a millionaire? is _________ at eight o’clock every Tuesday night. a. in b. on c. at d. from 12.Could you turn _________ the volume please? I can’t hear that singer very well. a. up b. down c. on d. off 13.I like watching the news _________ I want to know what is happening around the world a. and b.so c.but d.because 14.It’s a fantastic _______. If you answer ten questions correctly, you can win a million pounds a. fashion show b. talk show c.gameshow d. reality show 15.The film was _________. I felt asleep in the middle. a. scary b.boring c.exciting d.entertaining 16.The person who makes sure that a game is played according to the rules is called a ________. a. coach b. referee c. judge d. player 17.________ up the tree! You’ll fall down. a. Climb b. Climbing c. Not to climb d. Don’t climb 18.________ spectator sports in Britain are cricket and football. a. More popular b. The more popular c. Most popular d. The most popular 19.________ are the Olympic Games held? - Every four years. a. When b. Where c.How long d.How often 20.Which sport happens in a ring? a. Boxing b. Basketball c.Aerobics d.Swimming

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