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Nguyentanphat30
2 năm trước
Cho tam giắc ABC vuông tại A D l à điểm đối xứng với H qua AB E là điểm đối xứng với H qua AC DH giao với AB tại Một EH giao với AC tại N hỏi Tứ giắc âm nhạc là hình gì D là điểm đối xứng với E qua A BC=BD+BE I và k lần lượt là trung điểm điểm BH,BC Chứng minh MINK là hình tháng vuông
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