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maithithanhxuan1987
2 năm trước
Cho tam giác ABC có ba góc nhọn và nội tiếp đường tròn tâm O. Kẻ OM vuông góc AB và ON vuông góc AC (M thuộc AB; N thuộc AC). a) Chứng minh rằng tứ giác AMON nội tiếp. b) Các tia OM, ON cắt đường tròn (O) lần lượt tại P; Q. Nối BQ cắt CP tại I. Chứng minh rằng AI là phân giác của góc BAC và chứng minh rằng QA = QI. Giúp em ý a + vẽ hình, nếu làm được thì giúp em ý b luôn nhá
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