Mathematics, 30.08.2021 06:00, yatayjenings12
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
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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