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Huyen123
2 năm trước
cho tam giác ABC vuông cân tại A, D là điểm bất kỳ trên cạnh AB, trên nửa mặt phẳng bờ AB có chứa điểm C vẽ tia Bx sao cho góc ABx = 135 độ.Đường thẳng vuông góc với DC kẻ từ D cắt tia Bx tại E. Chứng minh Tam giác DEC vuông cân
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