Đáp án:
`AB=5cm
Giải thích các bước giải:
Áp dụng định lý Pi ta go vào `ΔABC(hat{A}=90^o)` có:`BC^2=AB^2+AC^2` mà `AC=12cm;BC=13cm``=>13^2=12^2+AB^2``=>AB=sqrt{13^2-12^2}=5(cm)`Vậy `AB=5cm`
Áp dụng định lý Pytago trong tam giác vuông ABC ta có:
AB^2 = BC^2 - AC^2 = 13^2 - 12^2 = 25
=> AB = √25 = 5 (cm)
ai giúp em bài trắc nghiệm anh với ạ
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