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底面周長是12.56米,底面半徑=12.56/3.14*2=2米 高=5分米=0.5米 圓柱的表面積 =3.14*2*2*2+12.56*0.5 =31.4平方米 體積=3.14*2*2*0.5=6.28立方米
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