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設高為x釐米,則底面半徑為1/3x釐米, 3.14×(1/3x)²;×2+3.14×1/3x×2×x=314 解得x²;=225/2=112.5,故圓柱的側面積3.14×1/3x×2×x=235.5平方釐米.
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