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2 năm trước
Bài 5: Cho ΔABC vuông tại A có AB = 5cm, AC = 12cm. a)Tính BC. b)Trên tia đối của tia AB lấy điểm D sao cho AD = AB. Chứng minh ΔABC = ΔADC. c)Đường thẳng qua A song song với BC cắt CD tại E. Chứng minh ΔEAC cân. d)Gọi F là trung điểm của BC. Chứng minh rằng CA, DF, BE đồng quy tại một điểm. GIÚP MK VỚI !!!!! CẢM ƠN CÁC BẠN
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