user-avatar
lanle876346
2 năm trước
Cho tam giác ABC vuông tại A, có AB = 12cm, AC = 16cm. Kẻ AH vuông góc với BC. Tia phân giác của góc ABC cắt AC tại D a) Tính BC và tỉ số AD/DC b) Chứng minh tam giác HBA đồng dạng với tam giác ABC c) Tính tỉ số diện tích của tam giác HBA và tam giác ABC d) Gọi E là hình chiếu của điểm C trên đường thẳng BD; K là giao điểm của BD và AH. Chứng minh rằng AB2 = BK. BE
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Điền từ vào chỗ trống 1. ( NATION ) Do you have a __ costume in your country? 2. ( ATTRACT ) But traveling by public transport is very __ as there are long delays. 3. ( ARRIVE ) They’re going to announce the __ of the Prince. 4. ( HARM ) The gas from the chemical factory was extremely __ 5. ( MANAGE ) The restaurant is now under new __ 6. ( SATISFY ) Your money will be refunded if the goods are not to your complete __ 7. ( INDUSTRY ) Ants and bees are described as __ insects. 8. ( EMPLOY ) The governments has promised to deal with the problem of __ among young people. 9. ( HYPOCRITE ) I think it's sheer __ to get married in church if you don't believe in God. 10. (SENSE) At the peace talks to discuss the war in South America, the British Foreign Minister told the press that everything was being done to put an end to the ___ killing that was going on. 11. (NATURE) I don't care what you say. I still think it's very _____not to want to get married and have children. 12. (POLITICS) In my opinion, all ____ are equally bad, irrespective of which party they belong to. 13. (ENTHUSIASM) Although he was not ___ about helping with the washing up; he did so all the time. 14. (CREATE) Artists are __ people. 15. (HISTORY) It’s forbidden to destroy __ buildings

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