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Bài 1: Cho tam giác ABC cân tại A, gọi F là trung điểm của BC. a) Chứng minh: AABF= AACF b) Chứng minh : AF vuông góc BC c) Cho AB = 13 cm, BC == 10 cm. Tính AF. Bài 2: Cho AABC. M là trung điểm cạnh BC. Trên tia đối của tia MA lấy điểm D sao cho MD = MA a) Chứng minh: A ABM = ADCM. b) Chứng minh : AB // DC. c) Kẻ AH vuông góc với BC ( H e BC). Trên tia AH lấy điểm E sao cho HE = HA. Chứng minh: BE = CD. giúp mình với help me mai đi học gồi
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