Cho tam giác ABC vuông tại C. Biết AB=8,5cm ,AC=7,5cm. Tính BC

2 câu trả lời

Áp dụng định lí Pitago cho ΔABC vuông tại C ta được:

BC^2=AB^2-AC^2

⇒BC^2=8,5^2-7,5^2

⇒BC^2=16

⇒BC^2=4^2

⇒BC=4cm

Vậy BC=4cm

 

🐌💦

\triangleABC vuông tại C

Áp dụng định lí Py-ta-go ta có:

\text{AB² + AC² = BC²}

$\text{BC² = AB² - AC²}$ 

$\text{BC² = 8,5² + 7,5²}$ 

\text{BC² = 72,25 - 56,25}

\text{BC² = 16}

\text{BC² = 4²}

\text{BC = 4}

Vậy \text{BC = 4cm}

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