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hungdzai13
1 năm trước
Cho đ ờng tròn (O; R) và 1 điểm A nằm cách O một kho ng bằng 2R. Từ A vẽ các tiếp tuyến AB, AC với đuòng tròn (O) (B, C là các tiếp điểm). ờng thẳng vuông góc với OB tại O cắt AC tại N, đ ờng thẳng vuông góc với OC tại O cắt AB tại M. a) Chứng ming rằng: AMON là hình thoi. b) ờng thẳng MN là tiếp tuyến của đ ờng tròn (O). c) Tính diện tích hình thoi AMON
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