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lhcam2010
2 năm trước
Cho tam giác ABC vuông tại A nội tiếp đường tròn tâm O, kẻ đường kính AD. Gọi M,N theo thứ tự là hình chiếu vuông góc của B,C trên AD, AH là đường cao của tam giác ABC (H thuộc BC). a,CM: HM vuông góc với AC b, Xác định tâm đường tròn ngoại tiếp tam giác MHN c,Gọi R là bán kính đường tròn ngoại tiếp, r là bán kính đường tròn nội tiếp tam giác.CM R+r>_ căn(AB.AC)
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