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nguyendangtrivan
1 năm trước
Tam giác AMN cân tại A, kẻ AI phân giác (I thuộc MN) a) Chứng minh IM=IN b)Trên tia đối MA lấy B, trên tia đối NA lấy C sao cho MB=NC. Chứng minh MN//BC c) kẻ IH vuông góc AM (H thuộc AM), Kẻ IK vuông góc AN (K thuộc AN) . Chứng minh IH= IK d) Trên tia đối IK lấy P sao cho IP=IK. Chứng minh MP vuông góc PI (NHỚ VẼ HÌNH THANKS)
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