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tamnhutheantt
2 năm trước
Tam giác ABC có góc B = 45 độ, góc C = 120 độ Trên tia đối của tia CB lấy điểm D sao cho cho CD = 2CB. Kẻ DE vuông góc AC.Chứng minh rằng: a, CE=CB b,Tam giác AEB là tam giác cân c,Tam giác AED là tam giác gì ? Vì sao ? d,Tính góc ADB
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