[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 11: [Bình Dương – 2016 – 2017]

Cho tam giác ABC có ba góc đều nhọn (AB < AC) nội tiếp trong đường tròn tâm O, kẻ đường cao AH. Gọi M, N là hình chiếu vuông góc của H trên AB và AC. Kẻ NE vuông góc với AH.
Đường vuông góc với AC tại C cắt đường tròn tại I và cắt tia AH tại D. Tia AH cắt đường tròn tại F.
a) Chứng minh ABC= ACB =BIC và tứ giác DENC nội tiếp được trong một đường tròn.
b) Chứng minh hệ thức AM.AB = AN.AC và tứ giác BFIC là hình thang cân
c) Chứng minh: tứ giác BMED nội tiếp được trong một đường tròn.


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Posted by Nam Trang Ánh to Trang Ánh Nam at January 3, 2019 at 8:45 AM

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