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∵SinA/a=SinB/b, ∴SinB=4/9, ∴B≈26°, ∴C=180-A-B=4° ∵c²=a²+b²-2ab*CosC, ∴c=根號(18²+16²-2*18*16*Cos4°)≈2.32 (也可根據SinC/c=SinA/a求得c)
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