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cun520jk
2 năm trước
cho nửa đường tròn tâm O đường kính AB bằng 2r ,bán kính OC vuông góc với AB. M là một điểm nằm trên cung nhỏ BC, AM cắt BC tại N. a) Chứng minh tứ giác obmn nội tiếp B) C/m AM.AN=2R^2 c) kéo dàu BN cắt nửa đường tròn tại K. C/m 3 đường thẳng AK,BN,ON đồng quy
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