user-avatar
kykhi2k1
2 năm trước
Cho ABCvuông tại A, các tia phân giác của góc B và C cắt nhai tại I. Gọi H, J, K lần lượt là hình chiếu của I trên AB, AC, BC. Biết KI = 1 cm; BK = 2 cm; KC = 3cm. a) Chứng minh    BHI BKI b) Chứng minh AHI vuông cân. c) Tính chu vi và diện tích tam giác ABC.
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

1.David had gone home before we arrived. – After ……………………………………………………………………………………. 2. We had lunch then we took a look around the shops. – Before …………………………………………………………………………………… 3. The light had gone out before we got out of the office. – When……………………………………………………………………………………. 4. After she had explained everything clearly, we started our work. – By the time ……………………………………………………………………………. 5. My father had watered all the plants in the garden by the time my mother came home. – Before …………………………………………………………………………………. 6. After my brother had finished his work, he went out with his wife. When my brother …………………………………………………………………… 7. As soon as my father ate dinner, he watched news programme. After my father ………………………………………………………………………. 8. My children did their homework, then listened to music. When My children ………………………………………………………………….. 9. I asked my teacher at first, I did my homework. Before I……………………………………………………………………………….. 10. When my grandpa came to my house, my parents had gone out. By the time ………………………………………………………………………….. 11. Before I answered your question, I had thought carefully. When I ……………………………………………………………………………….. 12. After my son had left, I returned my job. Before I ………………………………………………………………………………. 13. As soon as we reviewed all the tests , we took the final exam. After …………………………………………………………………………………… 14. I prepared all necessary things, then I went to camping last week. When …………………………………………………………………………………..

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