Giải thích các bước giải:
Áp dụng định lý Pytago vào Δ vuông ABC ta có :
BC² =AB² +AC²
= 5² + 12²
=169
⇒ BC = √169 = 13
vẬY BC = 13
Áp dụng định lý pytago vào tam giác ABC có góc A=90 độ ta được:
$BC^{2}$=$AC^{2}$+ $AB^{2}$
⇒$BC^{2}$=$12^{2}$+$5^{2}$
⇒$BC^{2}$=144+25
⇒$BC^{2}$=169
⇒BC=$\sqrt{169}$=13(cm)
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