[Trang Ánh Nam] New comment on Ôn thi Tuyển Sinh 10 - Phần Hình Học.

Nam Trang Ánh has left a new comment on your post "Ôn thi Tuyển Sinh 10 - Phần Hình Học":

Câu 6: [Yên Bái – 2016 – 2017]
Cho tam giác nhọn ABC nội tiếp đường tròn (O). Gọi H là giao điểm hai đường cao BD và CE của tam giác ABC (D ∈ AC, E ∈ AB)
a) Chứng minh tứ giác ADHE nội tiếp trong một đường tròn.
b) Đường thẳng AO cắt ED và BD lần lượt tại K và M. Chứng minh AK.AM = AD.AD
c) Chứng minh BAH = OAC


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Posted by Nam Trang Ánh to Trang Ánh Nam at December 25, 2018 at 3:01 AM

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