Mathematics, 03.08.2021 04:50 amourjenny

Cho tam giác ABC vuông tại A có AB=5cm AC=12cm a, tính BC
b, trên tia đối của tia AB lấy D sao cho AD = AB . chứng minh tam giác ABC = tam giác ADC
c, Đường thẳng A song song với BC cắt CD tại E. chứng minh tam giác EAC cân
d, Gọi F là trung điểm của BC. chứng minh rằng: CA , DF, BE đồng quy tại 1 điểm

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Cho tam giác ABC vuông tại A có AB=5cm AC=12cm a, tính BC
b, trên tia đối của tia AB lấy D sa...

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