namikanachi2008 namikanachi2008
  • 09-12-2022
  • Mathematics
contestada

Cho nửa dường tròn tâm O đường kính AB và dây CD(C, D ko trùng với A, B và AC a) Chứng minh: 4 điểm N, C, H, D cừng thuộc một dường tròn
b) Chứng minh: NH vuông góc với AB
c) Qua N kẻ đưởng thẳng vuông góc với NO cắt AD và BC lần lượt ở E và F. Chứng minh: NE = NF

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