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nguyenhaidangbom
2 năm trước
Cho tam giác ABC vuông tại A có AB <AC. Gọi I,M,K lần lượt là trung điểm của AB,BC,CA. a) Chứng minh AIMK hình chữ nhật b)Trên tia MI lấy điểm E sao cho I là trung điểm của ME, trên tia MK lấy điểm F sao cho K là trung điểm của MF . Chứng minh IK//EF và EF=2IK c)Vẽ AH vuông góc với BC tại H . Chứng minh tứ giác IKMH là hình thang cân d)Cho IK=2MH. Tính góc ABC
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