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tuongvynguyen671
2 năm trước
Cho tam giác ABC vuông tại A. Lấy B làm tâm vẽ đường tròn tâm B bán kính AB.Lấy C làm tâm vẽ đường tròn tâm C bán kính AC, hai đường tròn này cắt nhau tại điểm thứ 2 là D.Vẽ AM, AN lần lượt là các dây cung của đường tròn (B) và (C) sao cho AM vuông góc với AN và D nằm giữa M; N. a) CMR: ΔABC = ΔDBC b) CMR: ABDC là tứ giác nội tiếp c) CMR: Ba điểm M, D, N thẳng hàng d) Xác định vị trí của các dây AM; AN của đường tròn (B) và (C) sao cho đoạn MN có độ dài lớn nhất. Chuyên gia hangbich ơi giúp em với ạ
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