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圓柱周長為12.56cm,半徑為r=2cm 圓柱面積S=底面積×高=πr²;×h=113.04平方釐米 又因圓柱面積=3×圓錐面積,所以鍛造後圓錐面積=113.04×3=339.12平方釐米 圓錐面積=1/3πr²;×高=339.12解出高=12CM
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