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Mathematics, 11.12.2021 14:00 mruffier8909
Cho nửa đường tròn (O) đường kính AB. Trên nửa mặt phẳng bờ AB chứa nửa đường
tròn, vẽ tia Ax, By là hai tiếp tuyến của (O). M là điểm bất kì trên tia Ax. Qua M kẻ tiếp
tuyến với nửa đường tròn tại C, cắt By tại N. MO cắt AC tại I. NO cắt CB tại K.
a) Tứ giác CIOK là hình gì ? Vì sao?
b) Biết AB = 2r, AM = . Tính diện tích tứ giác AMNB theo r.
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Cho nửa đường tròn (O) đường kính AB. Trên nửa mặt phẳng bờ AB chứa nửa đường
tròn, vẽ tia Ax, By...
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