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Mathematics, 30.08.2021 06:00 arom7470
Cho tam giác ABC có ba góc nhọn, đường cao AH. Vẽ HM, HN lần lượt vuông góc với
AB, AC. Trên tia đối của tia MH lấy MD=MH, Trên tia đối NH lấy điểm E sao cho NE= NH.
Gọi I và K là giao điểm của DE với AB và AC. Chứng minh rằng:
a. IB là tia phân giác của góc HID.
b. HA là tia phân giác của góc IHK.
c. IC là tia phân giác của góc HIK.
d. IB vuông góc với IC
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Answers: 2
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Cho tam giác ABC có ba góc nhọn, đường cao AH. Vẽ HM, HN lần lượt vuông góc với
AB, AC. Trên tia đ...
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