[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":

TP. Hồ CHí Minh năm 2018-2019
CHo tam giác nhọn ABC có BC=8 cm. Đường tròn tâm O đường kính BC cắt Ab, AC lần lượt tại D và E. Hai đường thẳng BD và CE cắt nhau tại H.
a) chứng minh: AH vuông góc với BC.
b) Gọi K là trung điểm của AH. Chứng minh tứ giác OEKD nội tiếp.
c) Cho góc BAC=60 độ. Tính độ dài đoạn DE và tỉ sô diện tích của 2 tam giác AED và ABC.

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Posted by Nam Trang Ánh to Trang Ánh Nam at December 25, 2018 at 2:33 AM

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