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Tuxuan2018
2 năm trước
Bài 1. Cho ∆ABC vuông tại A có AC = 4cm, 𝐶̂ = 60 độ. Trên tia đối của tia AC lấy điểm D sao cho AD = AC. a) Chứng minh: ∆ABD = ∆ABC b) Chứng minh: ∆BCD là tam giác đều. c) Tính độ dài các đoạn thẳng AB và BC.
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