[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 8: [Bến Tre 2015 – 2016]

Cho nửa đường tròn (O;R), đường kính AB. Trên nửa mặt phẳng bờ AB chứa nửa đường
tròn (O; R), vẽ các tiếp tuyến Ax, By với nửa đường tròn. Gọi M là điểm bất kì trên cung AB (M ≠ A; M ≠ B). Tiếp tuyến tại M với nửa đường tròn (O; R) cắt Ax, By lần lượt tại C và D.
a) Chứng minh tứ giác ACMO nội tiếp.
b) Chứng minh tam giác COD vuông.
c) Chứng minh: AC. BD = R2
d) Trong trường hợp AM = R. Tính diện tích hình viên phân giới hạn bởi dây MB và cung MB của nửa đường tròn (O; R) theo R.


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Posted by Nam Trang Ánh to Trang Ánh Nam at December 25, 2018 at 3:02 AM

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