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diepthianh2008
2 năm trước
Cho tứ giác ABCD nội tiếp đường tròn tâm O bán kính R(đường kính BD) AD>AB Đường thẳng qua A vuông góc BD tại N cắt đường tròn tâm O tại M .Dây cung BC cắt dây cung AM tại I 1) Chứng minh tứ giác NICD nội tiếp 2) Chứng minh BN.BD=BI.BC 3) Qua N kẻ đường thẳng // AC cắt dây cung BC tại P đường thẳng NB cắt PC tại Q.Chứng minh tứ giác MPCQ là hình chữ nhật Hai câu đầu mình làm được mình muốn hỏi câu 3 ạ
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