cho tam giác ABC vuông tại A đường cao AH.BH=a, diện tích tam giác ABC=2 a2 Tính AB,AC,BC

Giúp mình với...................

II. Combine these sentences using : That , which , who , whom or whose 1. A woman answered the phone . She told me you was busy . 2. The bus is always crowded . I take it to school every morning . 3. They are singing a song. I don’t know the song . 4. A man spoke to me . He was very helpful . 5. A midwife is a woman. She assists other women in childbirth . 6. They are the children . Their team won the match . 7. The house is for sale . It has the green shutters . 8. My farther bought a motor bike . The motorbike costs 2 thousand dollars 9. They are the postcards . I sent them from Australia . 10. The house has been built in the forest . It doesn’t have electricity 11. The girl chatted with him yesterday . She arrived here at 6 : 30 12. I’m reading the book . I bought it in London in 1996 . 13. Trang couldn’t come to the party . This was perfectly true 14. Do you know the girl ? Tom is talking to the girl . 15. Tuan speaks English very well . He comes from Vietnam. 16. The man invited me to his party . He was really polite . 17. A lion is an animal . This animal lives in Africa . 18. I have a class . It begins at 8 am . 19. A globe is a ball . This ball has a map of the world on it . 20. The soup was too salty . I had it for lunch . 21. We are visiting Ha Long . Ha Long is in the north of Vietnam. 22. My father is an doctor . He has gone to abroad . 23. Ms Kim Anh will be our History teacher next semester . You talked with her yesterday . 24. The watch belongs to Lam . It is in the bathroom . 25. Do you know the new student ? I can’t remember his name . 26. Mary is a bit deaf . She didn’t hear the phone 27*. We’ll meet Peter tomorrow . He has 2 brother and one sister . 28. We are talking to Viet Nam . Viet Nam has a population of 87 million people . 29. We are talking to Viet Nam . Its population is 87 million people . 30. I should phone the man . I borrowed his car yesterday .

Bài 2. Cho (O; R) đường kính BC, A thuộc (O) sao cho AB = R. Vẽ đường tròn I đường kính AC cắt BC tại D. a) Chứng minh tứ giác ADOI nội tiếp. b) Tứ giác ABOI là hình gì ? c) Tính diện tích tứ giác ABOI theo R. bài tập hình học 9.........

Giúp tui lằm bài này ik gấp lắm

Làm ơn giúp mình với!!!!!!! Cho tam giác ABC vuông tại A. Đường cao AH. Gọi E,I,K theo thứ tự là giao điểm của các đường phân giác trong tam giác ABC, ABH, ACH. CMR: AE vuông góc với IK

Giúp mình bài này với,cảm ơn nhiều

vẽ chibi buồn NL: ms sang parris có mấy ngày mà đã chán ròi

Ai giúp em với ạ em cảm ơn rất nhiều

ai đó giúp mình với cô giáo gửi bài này tui ko biết làm