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圓柱的體積/圓柱的側面積 =πR²;H /(2πRH) =R/2 所以 圓柱的底面半徑R =(200÷100)×2 =2×2 =4(釐米) 它的表面積 =底面積×2+側面積 =3.14×4×4×2+100 =100.48+100 =200.48(平方釐米)
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