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xoa2010474232
2 năm trước
Cho ΔABC vuông tại A có AB = 8cm, BC = 10cm. a/ Tính AC. b/ Trên tia đối của tia AC lấy điểm D sao cho AC = AD. Chứng minh ΔBDC cân. c/ Kẻ AN  BC (N AC), AM  BD (M AD). Chứng minh ΔAMN cân. Mn ơi giúp em với ạ, em cảm ơn nhiều
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