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lph2801
2 năm trước
Cho nửa đường tròn(O;R) đường kính AB.Trên nửa mặt phẳng bờ AB chứa nửa đường tròn(O;R),vẽ các tiếp tuyết Ax,By của nửa đường tròn.Lấy điểm E thuộc thia đối của tia AB sao cho AE = R.Từ E kẻ tiếp tuyến EM tới nửa đường tròn (M là tiếp điểm) cắt Ax và By theo thứ tự tại C và D 1.Chứng minh tứ giác ACMO nội tiếp đường tròn 2.Chứng minh EM . ED=6R^2
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