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toantamhy
2 năm trước
Cho góc nhọn xOy, lấy điểm A nằm bên tron góc đó. Vẽ AB vuông góc với Ox ở B; BD vuông góc với Oy ở D; AC vuông góc với Oy ở C; CE vuông góc với Ox ở E. OA cắt DE tại K. a) Chứng minh hai tứ giác ABOC và BCDE nội tiếp. b) BCO bằng những góc nào? c) Chứng minh: OA vuông góc DE mk đga cần gấp ạ!!
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