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利用余弦定理,因為C=12最大,所以角C是最大的角, AB^2=BC^2+AC^2-2BC*AC*CosC CosC=(BC^2+AC^2-AB^2)/2BC*AC BC^2+AC^2-AB^2=100+81-144=37>0 CosC>0 角C小於90度,所以三角形ABC是一個銳角三角形.
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