[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 1: [Bà Rịa – Vũng Tàu 2015 – 2016 ]

Cho đường tròn (O) và một điểm A nằm ngoài (O). Dựng cát tuyến AMN không đi qua O, M nằm giữa A và N. Dựng hai tiếp tuyến AB, AC với (O) ( B,C là hai tiếp điểm và C thuộc cung nhỏ MN). Gọi I là trung điểm của MN.
a) Chứng minh tứ giác OI nội tiếp.
b) Hai tia BO và CI lần lượt cắt (O) tại D và E (D khác B, E khác C). Chứng minh góc CED = góc BAO.
c) Chứng minh OI vuông góc với BE
d) Đường thẳng OI cắt đường tròn tại P và Q (I thuộc OP); MN cắt BC tại F; T là giao điểm thứ hai của PF và (O). Chứng minh ba điểm A; T; Q thẳng hàng.


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Posted by Nam Trang Ánh to Trang Ánh Nam at December 25, 2018 at 2:57 AM

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